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An Overview of the Origins and Effectiveness of Commercial Fitness Equipment and Sectoral Corporate Settings: A Critical Review of Literature

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Research Question: Fitness equipment is a worldwide ever-growing phenomenon and its usage is nowadays popular both in human routines and academic investigations. Research Methods: This paper is a literature review aiming fitness equipment in relation to all the available findings connected to the complete product life-cycle phases. Results and Findings: Manufacturing industries, which are active realities of the sector, have not been a major concern for sport researchers within the production applicability sub-field. Past root hypotheses, the current state of the art and future guideline applications are addressed. Selected articles were categorised chronologically, by journal, by geographic area and, extensively, by content. Five thematic areas were included: (1) historical background, (2) creation stages, (3) product features, (4) innovation paths and (5) sectoral environments and marketing processes. Implications: By means of the provided findings, there is an opportunity to widen approaches to study fitness equipment that could be extended to the sector’s enterprise applications and methods of work.
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applied
sciences
Article
An Overview of the Origins and Eectiveness of
Commercial Fitness Equipment and Sectoral
Corporate Settings: A Critical Review of Literature
Silvio Addolorato 1, * , Jerónimo García-Fernández 2, Leonor Gallardo 1and
Jorge García-Unanue 1
1IGOID Research Group, University of Castilla-La Mancha, Avda. Carlos III, s/n, 45071 Toledo, Spain;
leonor.gallardo@uclm.es (L.G.); jorge.garciaunanue@uclm.es (J.G.-U.)
2Physical Education and Sport Department, University of Seville, C/Pirotecnia, s/n, 41013 Seville, Spain;
jeronimo@us.es
*Correspondence: silvio.addolorato@gmail.com
Received: 25 January 2020; Accepted: 19 February 2020; Published: 24 February 2020

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Abstract:
Research Question: Fitness equipment is a worldwide ever-growing phenomenon and
its usage is nowadays popular both in human routines and academic investigations. Research
Methods: This paper is a literature review aiming fitness equipment in relation to all the available
findings connected to the complete product life-cycle phases. Results and Findings: Manufacturing
industries, which are active realities of the sector, have not been a major concern for sport researchers
within the production applicability sub-field. Past root hypotheses, the current state of the art
and future guideline applications are addressed. Selected articles were categorised chronologically,
by journal, by geographic area and, extensively, by content. Five thematic areas were included:
(1) historical background, (2) creation stages, (3) product features, (4) innovation paths and (5) sectoral
environments and marketing processes. Implications: By means of the provided findings, there is an
opportunity to widen approaches to study fitness equipment that could be extended to the sector’s
enterprise applications and methods of work.
Keywords:
fitness equipment; fitness industry; life-cycle approach; literature review; manufacturing
industries; product design; product development
1. Background
Fitness is generally seen as a late 20th-century phenomenon, but it is important to recognise that
some of its roots had already evolved more than a century before [
1
]. Modern technological fitness
equipment has been transformed into a considerable and successful industry, and marketing products
and their omnipresence, as human-related machines, play a crucial role [
2
]. A modern fitness centre is
highly ecient in its use of time and space, both in architecture as well as in the simultaneous use of
fitness technologies. Users have learned to monitor their own bodies according to the standards of
being ‘fit’. The globalisation of modern fitness culture can be considered an illuminating example of
the more embracing momentum toward a global monoculture, and it is a recognisable and adaptable
phenomenon worldwide [
3
]. The unification and standardisation of fitness (both equipments and
practices) have been crucial for the globalisation of the fitness industry [
4
]. The historical development
of modern gym and fitness culture can be described analytically to understand the emergence of this
multi-billion-dollar phenomenon [5,6].
The private sector of the global health club industry experiences continuous growth, and sectoral
facilities serve 162 million members worldwide [
2
]. The outlook of the fitness industry is promising
Appl. Sci. 2020,10, 1534; doi:10.3390/app10041534 www.mdpi.com/journal/applsci
Appl. Sci. 2020,10, 1534 2 of 19
and the sector is expected to thrive in the global marketplace, serving consumers with a variety of
health and fitness needs. With access to fitness amenities, instructors, personal trainers and coaches
and club operators are well positioned to lead a healthier world.
‘Health’ and ‘fitness’ (H&F) are by no means unambiguous terms. The World Earth Organization
defined health as a state of complete physical, mental and social well-being, not merely the absence
of diseases or infirmities [
7
]. The term fitness poses similar problems; today it is often equated with
muscle size, body contour and the ability to sustain a 30-min exercise bout. It is expected that typical
lifestyles of the current and future populations will be opulent and comfortable, as quality of life
improves due to the increase in household income and reduction in working hours [
8
]. In the meantime,
as the standard of living becomes increasingly more comfortable, the toll on physical health becomes
magnified as a result of bodily weight issues and insucient exercise caused by super nutrition and
change in work conditions (from physical to mental labour).
For this reason, H&F industry is an important contributor to every national preventative health
policies against overweight and obesity lifestyles, and directly associated with the related human risk
factors [
9
]. For this reason, every fitness centre plays an important role and, every type of available
fitness amenity, is the common mean through which is possible to meet the market demand [10].
This has created a deep awareness of fitness for many people, forcing them to recognise the
importance of daily exercise and physical activity. The high annual growth rate in the fitness and
athletic equipment market, which is more than 20%, is attributed to this phenomenon [
11
]. Fitness
equipment can be used to improve cardio-pulmonary function, strengthen leg muscles, consume body
fat and improve the physical constitution.
It is dicult to make a clear distinction between fitness ‘goods’ and ‘services’, since classes or
programmes are hardly ever sold without some material goods and vice versa [
12
]. Fitness products
mean equipments, classes, programmes and services (incorporating intangible and new ‘concepts’)
involving all kinds of fitness accessories and amenities, including guide books, DVDs and tutorial
videos [
12
]. Evaluating the fitness world, it has been found as a literal sense of a bodily state, in how
various attributes of dierent extraction come to the intelligible as inhabitable worlds [13].
Fitness equipment is an important part of fitness ‘routines’. It has become an unescapable trend
due to the rapid development of information technology (IT) and electronic technology, using, for
example, photoelectric methods to detect the physiology index of the human body [
14
]. According to
Dibble [
15
], cardio-vascular equipments are more prone to becoming monotonous, muscle-conditioning
devices develop themselves into computerised version of strength training machines. Both categories
provide users visual and sonar feedback (based on velocity, measuring distance, range of motion, etc.)
bring these ‘mature’ products to a new innovative era as well.
As globally delivered, H&F services will become more common in the future [
4
]. The question of
standardising bodily movements thus becomes more relevant and could represent new ways in which
human immaterial resources are capitalised. Gymnastics, without material equipment, were defined
as too routine, and training with new devices generates strong and bold people [16].
Yet, comparatively speaking, researchers in the field of sports product innovation have largely
ignored the importance of manufacturing industries as the source of every apparatus available in
every sport facility around the world. The fitness ‘brand’ is independent of the actual product and is
unique to the company to which a potential buyer maintains loyalty [
17
]. For the same reason, during
purchasing choices, sport clubs need to take into consideration several aspects and not only focus on
supply management of fitness equipment allocation in relation to industry providers [18].
Against this backdrop, the aim of this paper is to provide a traditional literature analysis on all
products’ life-cycle steps: from the historical hypotheses that lead to the initial sectoral milestones,
through the state of the art related to the creation ways of works and the quality variables that compose
what already exists in international markets, to the innovation processes that currently define and
present this industry’s final ‘material’ results inside contexts and societies.
Appl. Sci. 2020,10, 1534 3 of 19
For this reason, this research is able to highlight this gap in the knowledge about fitness equipment
and what has emerged in published studies in relation to sectoral ‘companies’, simultaneously to all
which is defined in literature as product ‘featuring’, ‘innovation’ and ‘technology’ development. The
selected objective could also provide and bring practitioners to a newly version of ‘win-win solution’
between academics and corporate settings, in matching and share useful information. The article
presents relevant articles published in the last 40 years, the most important age of the fitness industry.
In this context, it has been debated whether sports scientists need to enter this fitness industry sub-field
more proactively.
2. Methodology
Traditional literature analysis is defined as a method involving a comprehensive search for relevant
knowledge and studies on a specific topic, and those identified and selected are then appraised and
synthesised [
19
,
20
]. The purpose of this type of review is to analyse a large and varied body of literature,
in order to understand the current state of the art, in this case regarding -fitness equipment- in relation
to other specific independent variables, through an appropriate search in electronic databases.
For this review, the search was not limited to sports-related journals but included articles located
in the areas of communication, design, engineering, history, IT, management, marketing, medicine
and surgery, psychology and human resources (HR), robotics and aerospace and social sciences. The
investigation was limited to research articles in a strict sense, including literature reviews, meta-analyses
and original papers. The following typologies were excluded (alphabetical order): bibliographic articles
and chapters, books, conference abstract, editorial and news articles, manufacturer or corporative
catalogues, sectoral letters and extended product’s trademarks (deposited licenses and patents).
A key problem encountered during the analysis is that, while there are numerous corporate case
studies and internal enterprise surveys (most unpublished or not made public), little is known about
the information available in scientific databases.
The analysis started in November 2015, and the latest search was performed on 31 May 2017. Data
collection was performed by one team of investigators experienced in the management and marketing
of products in the H&F sector and sports science.
2.1. Data Sources and Searches
Electronic databases, including Sport Discus, Academic Search Complete, MEDLINE, ISI - Web
of Science, CINAHL, Cochrane Library, PsycINFO, Ergonomic Abstracts, Business Source Premier,
Science Direct, Scopus and Google Scholar, were used for the extended literature analysis. This multiple
search strategy has been considered as an appropriate strategy due to the eclectic nature and wide
range of the targeted literature base (Table 1).
-
Searches included the following terms: ‘fitness equipment’ and (1) ‘company’, (2) ‘feature’,
(3) ‘innovation’ and (4) ‘technology’. The first key word has been kept fixed varying the remaining
four by using the Boolean Logic ‘AND’.
-
The references of each selected article were evaluated to identify other potentially relevant papers
that were not included among the indexed databases utilised by using the known ‘snowball’
technique [21,22].
-
Bibliographies from the retrieved literature were searched, together with the researcher’s personal
files, to add articles related to the purpose of the research.
-
The searches were limited to articles published in English but were not limited by country
of origin.
-
Relevant industry reports, oered by Europe Active [
3
] or IHRSA [
2
,
6
], were sought by tracking
the latest leading trends and geographical/society’s product applications.
Appl. Sci. 2020,10, 1534 4 of 19
Table 1. Traditional literature review criteria and approaches.
Criteria Approaches Adopted
Main topic Fitness Equipment
Related topics (‘AND’) (1) Company, (2) Feature, (3) Innovation and (4) Technology
Research method Snowball technique
Boundaries defined Title, abstract or key words include topics (first phase)
Full-text content articles (second phase, assessed by Jadad scale)
Not by investigation areas, not by period/time frame
Publications in English
2.2. Study Selection and Methodological Quality Assessment
The titles and abstracts obtained were screened to remove irrelevant or duplicated publications.
The full-text versions of the remaining papers were then read, analysed and evaluated in detail to
identify their eligibility.
The inclusion criteria of the selected articles were as follows:
-
Publications related to the content criteria for ‘fitness equipment’ that were published through
academic journals and directly intersected with the topics of ‘company’, ‘feature’, ‘innovation’
and ‘technology’ that should appear in the title, abstract, or keywords.
-
Where aims were not included in those topics, it has been analysed if has been extensively faced
or treated between the oered contents of the full-text version.
-
Articles published between 1978 (the lower limit was not previously defined at the beginning of
the review) and 2017 at the date of the last search performed.
- Papers written in English.
Once the relevant publications were finalised, the Jadad scale [
22
,
23
], was used to systematically
determine the quality of the articles for approval and acceptance. Having been done entirely by a
single reviser, a high standard of the results was sought for analysis selection. The standard set for
selection was all the articles that earned a punctuation of three or more points, which indicates good
quality. The chosen scale has the capacity to provide a complete overview of the external and internal
validities of papers included in this revision to determine the current state of the art.
Being a traditional literature review (and not a systematic one), the process through which these
twelve scientific selected databases have been analysed corresponds to the initial sample of material
retrieved. The final search, defined by the selection and quality assessments above listed, revealed 73
articles, of which 50 were found applying the previously explained content-related criteria.
2.3. Data Analysis
The rationale for this approach was that, targeted thematic analysis has been considered a useful
and flexible tool, which can potentially provide a rich and detailed understanding of eclectic data [
19
].
Additionally, this method enables researchers to identify, analyse and report patterns of meaning
(themes) across dierent epistemological and ontological positions.
When the selection was ready, findings were organised into five key paragraphs following the
traditional product’s steps development [
24
]: (a) historical background, (b) creation stages, (c) product
features, (d) innovation paths and (e) sectoral environments and marketing processes.
This overall categorization has been defined according to the logical life-cycle processes associated
with the fitness equipment (especially from the point ‘b’ to ‘e’), with a starting addition (point ‘a’)
focused on the origins and roots (formally named as ‘milestones’) of the commercial fitness equipment
provided by the selected paper during the analysis.
Appl. Sci. 2020,10, 1534 5 of 19
3. Results and Discussion
When considering the years of publication, an evident increase in papers on the focused topics of
interest was observed. Until the beginning of the 21st century, there is no continuity on production.
From 1978 (lower limit defined during the analysis) to 2006, only 14 articles were published (28%). In
the last 10 years (from 2007 to 2016), a mean of more than three publications per year (M =3.1) was
evidenced, with two peaks during 2011 and 2014 with a mean of 5.5 selected articles (Figure 1).
Appl. Sci. 2020, 10, x FOR PEER REVIEW 5 of 19
3. Results and Discussion
When considering the years of publication, an evident increase in papers on the focused topics
of interest was observed. Until the beginning of the 21st century, there is no continuity on production.
From 1978 (lower limit defined during the analysis) to 2006, only 14 articles were published (28%). In
the last 10 years (from 2007 to 2016), a mean of more than three publications per year (M = 3.1) was
evidenced, with two peaks during 2011 and 2014 with a mean of 5.5 selected articles (Figure 1).
Figure 1. Number of publications by year.
Regarding the origin of the published papers, the results evidenced a wide diversity of interest
areas, as previously listed. Up to 22 journals have been published on the topics investigated. Journals
with a greater number of publications were as follows: International Journal of the History of Sport
with three articles and Applied Ergonomics, Journal of Sport Management and Managing Leisure
(now Managing Sport and Leisure) with two papers each. These nine publications represent more
than a third (40.90%) of the journals on the subject studied (Table 2).
Table 2. Journal titles and number of related publications.
Journal Title
Number of Publications per Journal
The International Journal of the History of Sport
3
Applied Ergonomics
2
Journal of Sport Management
Managing Leisure (now: Managing Sport and Leisure)
ACSM’s Health & Fitness Journal
1
Acta Astronautica
Current Sports Medicine Reports
European Business Review
European Journal of Cultural Studies
European Journal of Marketing
Expert Systems with Applications
Gender, Place and Culture: A Journal of Feminist Geography
Human Resource Management Journal
International Journal of Precision Engineering and
Manufacturing
International Journal of Sports Marketing and Sponsorship
Journal of Beijing Sport University
Journal of Sport History
Perceptual and Motor Skills
0
1
2
3
4
5
6
1978
1984
1989
1994
1996
1997
1998
1999
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
Units
Figure 1. Number of publications by year.
Regarding the origin of the published papers, the results evidenced a wide diversity of interest
areas, as previously listed. Up to 22 journals have been published on the topics investigated. Journals
with a greater number of publications were as follows: International Journal of the History of Sport
with three articles and Applied Ergonomics, Journal of Sport Management and Managing Leisure
(now Managing Sport and Leisure) with two papers each. These nine publications represent more than
a third (40.90%) of the journals on the subject studied (Table 2).
Table 2. Journal titles and number of related publications.
Journal Title Number of Publications
per Journal
The International Journal of the History of Sport 3
Applied Ergonomics
2
Journal of Sport Management
Managing Leisure (now: Managing Sport and Leisure)
ACSM’s Health & Fitness Journal
1
Acta Astronautica
Current Sports Medicine Reports
European Business Review
European Journal of Cultural Studies
European Journal of Marketing
Expert Systems with Applications
Gender, Place and Culture: A Journal of Feminist Geography
Human Resource Management Journal
International Journal of Precision Engineering and Manufacturing
International Journal of Sports Marketing and Sponsorship
Journal of Beijing Sport University
Journal of Sport History
Perceptual and Motor Skills
Presence: Teleoperators and Virtual Environments
Scientia Iranica
Social Marketing Quarterly
Sport Science Review
Appl. Sci. 2020,10, 1534 6 of 19
A geographical analysis may also be as enlightening following some sample studies encountered
in literature, mostly focused on European [
25
] and North American [
26
] environments and their
revenues, cash flows and profitability.
Regarding the geographical distribution from which the selected studies have been performed
(both first author and co-author), the most active academics have been in Europe with 41.57% (22
articles) of the total sample assessed, followed by the Asia-Pacific area, with 33.96% (n =18) and North
America, with 20.75% (n =11). The lowest representation was in the Middle East, with 3.77% (n =2).
No publication matched the established criteria for Africa (including an association for the Middle East
and North Africa (MENA) area, as unified by the descriptors for the northern part of the continent) or
Latin America (Table 3).
Table 3. Numbers and percentages of publications’ geographic areas.
Geographic Areas Countries Selected Articles
N%
Asia—Pacific Australia 1 33.96
China 9
Japan 1
South Korea 3
Taiwan 4
Europe Denmark 1 41.57
Finland 3
France 2
Germany 2
Ireland 1
Norway 2
Sweden 2
The Netherlands 1
UK 8
Middle East Jordan 1 3.77
UAE 1
North America US 11 20.75
The European robust performance, but above all evidently spread in all the continent and
confirmed by sectoral investigation, led in first position by the UK with annual revenue of 6.1 billion
dollars/year [
2
,
6
]. Even in the Asia-Pacific area there is a correlation with the investigation’s findings;
these countries are home to maturing industries and current growth, and main examples are found
in cities such as Beijing, Shanghai, Kuala Lumpur and Jakarta. For North America, this analysis was
represented exclusively by the US; the latest annual revenue obtained was 27.6 billion dollars/year,
accounting for more than 35,000 facilities among all states [
2
]. No criteria matched studies from
Canada. Despite conflicts in several MENA countries, there is a demand for fitness, as consumers
seek to exercise and reap the benefits of an active lifestyle. Recently, successful international fitness
operators have expanded their operations into this area.
3.1. Historical Background
Some investigations encountered through this state of the art analysis, revealed the historical
root phases on what defined the fitness equipment categories arriving until how are nowadays
internationally labelled. These works came mainly from other literature reviews and are here redacted
with a chronology logic for two reasons: (a) to introduce the following paragraphs (product’s life-cycle
processes) and (b) to provide the current and updated vision of the fitness equipment sector since its
inception (Appendix C).
Appl. Sci. 2020,10, 1534 7 of 19
Van Hilvoorde [
1
], using a continental European approach, explains that a French visionary named
Hyppolite Triat, in the late-19th century, was one of the first to develop fitness ‘ideals’ by opening
commercially-exploited gymnasiums in Li
è
ge, Brussels and Paris. Gymnastics were transformed into
theatrical spectacles, planned with the circus groundwork (trapezes, beams, rope ladder and masts),
and a complete collection of weights (dumbbells, barbells, Indian clubs, etc.). At the same time, in the
Dutch context, Dr. Geraldus Arnoldus Nicolaas Allebe has been cited for his greater relevance. In
Germany, evidence has been found of ideas and machines focused on isolated muscular groups but
not developed within educational contexts. In sum, in this stage, fitness equipment was ‘freed’ from
ideological associations and was neutral with regard to variables such as gender, age and social class
(public or private spaces). During the same historical moment, when the first ‘artist-entrepreneurs’
such as MacFadden and Sandow finally arrive to the final audience, the evolution of fitness devices
in journals, for sports and physical education have definitively started. In this period, the main
communication tools were newspaper advertising, periodicals, books, photography and films.
In the late-19th century and the first three decades of the 20th century in Germany, England and
North America, distinctions between weight-lifting, bodybuilding, wrestling and circus-strongman
performances were not always clearly drawn [
27
]. These various disciplines were neither considered
nor practiced separately, and they were sometimes even understood as an organic whole. The final
goal in training with weights was to increase strength and develop an attractive body. These numerous
ideas and models were brought together around the turn of the century under the general term of ‘Life
Reform Movement’. In these environments, the most utilised means of advertisement were records,
lectures, specialist magazines and exercise handbooks.
In the past century, between the sixties and seventies, a number of events aected studies about
the history of medicine, the body, health and fitness [
7
]. The ‘motor’ metaphor was a useful device
for studying the body’s physiological and neurological processes. Some of the most useful works
concerning H&F were focused on exercise, physical training, sports and athletics. During the same
period, a Chinese perspective was provided by Zhang [
28
] that divided the national sports industry
into three stages: exploratory (1978–1992), formative (1993–1996) and developmental (1997-present).
The extrapolated studies also focus on ‘Nordic’ milestones of the fitness industry, from a wider
range of view, from the beginning [
16
] to the latter half of the 20th century [
29
]. The first study
addresses the introduction of gymnastics as a subject in the Norwegian school system. The rooms
allocation and the choice of equipments were used as instruments to form pupils’ bodies and minds.
The equipments already included were: climbing ribs (less than 100-cm-wide sections), ropes, rope
ladders, ladders, net ladders, beams, vaulting horses, box horses, bucks, springboards, cushions, balls,
jump ropes and mats. In contrast to Central Europe provided version [
1
], these equipments must
never transform gymnastics into acrobatics and ‘circum-like’ conditions. The second publication [
29
]
considerable attention to the development and organisation of fitness exercise inside the Scandinavian
Peninsula (Denmark, Norway and Sweden). This contribution brings to the actualised vision of the
activity forms included in for-profit fitness in three main types: (1) individual training studios, with a
variety of physical-amenities, aimed at strengthening specific body segments; (2) group-based trainings
(aerobic cardio-works, etc.) focused on cardiorespiratory endurance; and (3) relaxation exercises, not
always human-product related, that include a variety of wellness concepts and approaches. These
historical roots and milestones bring fitness equipment to the ‘modern era’ of the fitness industry.
3.2. Creation Stages
The first step, in the modern age of the fitness industry is, undoubtedly, given by the phases
needed to generate, from a cero or basic level, a new piece of training system, or almost define the
creation stages in what already exists in the current society (Appendices Aand B).
There is evidence that multi-sectorial teamwork is at the foundation of daily life manufacturing
industries [
30
]. Biomedical mechanics, manufacturing and design engineers, IT specialists and
human body practitioners act in unison. Countries around the world typically divide special
Appl. Sci. 2020,10, 1534 8 of 19
workout equipments into four creation categories: (1) hydraulic, (2) electric/electromagnetic damping,
(3) pneumatic and (4) gravity-mechanical. Always during the concept creation, in relation to the
procedures through which is normally to operate inside an enterprise, another classification of products
is provided by Fu [
14
] that divide equipment between oxygen and aerobic. Currently, it is hard to meet
the fitness needs of modern people with ‘traditional’ apparatus so both domestic and international
entities have begun to explore more ‘intelligent’ fitness equipment. These categories of machines can
collect physiological parameters and providing a wide variety of related functions (virtual channels,
explanatory videos, etc.), measure the size of ejection forces, and provide quantified training useful for
both trainers and trainees [30].
Products typically follow a cycle of introduction, growth, maturity, decline and termination [
31
].
The H&F industry is in the early maturity phase of the sector life-cycle. In this regard, Williams et al. [
32
]
underline that it is not always easy, depending on the magnitude of the reality in question, to acquire
‘Top of Mind Awareness’ (TOMA) in potential future customers. There are three primary reasons why
brand awareness is a component of brand ‘equity’: to increase customer consideration, create eective
decision-making and influence the brand association’s (product and/or service) formation.
As armed by two studies [
33
,
34
], manufacturing industries also need to take into account
variables related to the final operators, users and facilities in which they, regularly, are purchased.
Between these, there are safety practices connected to the hardware’s layouts, with operating procedures
and conditions required to correctly apply products in health centres. The four overall factors included
in the analysis are the enterprise’s guidelines for safe operations: (1) the importance of spaces for
hypothetical hazards, (2) possible barriers for people with physical disabilities, (3) obstacles or stairs to
‘get inside’ the machine and (4) the challenge of creating specific new fitness equipment (supposedly
the hardest topic) that does not contradict the previous points.
Current recommendations arm that fitness gyms and private health clubs are an outstanding
global business, but new ‘trends’ such as franchising chains, and specific-environment workout spaces
are the new frontiers of product creation aimed at final purchase and consolidation [5].
3.3. Product Features
The literature suggests a direct connection among all variables that define, catalogue and divide
fitness equipments in the electronic databases in the past decades. Since the beginning of the 21st
century, it has become evident that there are few dierences among the main bodies of the products
(indexed to each single sub-category), brands and marketing promotions [
35
]. The barriers of entering
and withdrawing in the trades become bigger, and the point of view of the industrial organisation (from
theory to the practice) plays a key role. The size and mass of the devices are important parameters [
36
],
as well as other parameters analysed in the literature (Appendices Aand B).
Numerous studies focus on the indispensable physiological, anthropometric and biomechanical
paradigms [
37
]. H&F devices have wide application: laboratories, training centres, competitive
contexts, etc. These are the reasons why these body-related factors are defined as basic knowledge
in the field. The versatility, for a product designed with ergonomic criteria, indicates hypothetically
high levels of usability. As seen in the visionary approach of Reilly and Thomas [
38
], the man-machine
interface needs anthropometric data to give correct responses to the users who interface with it.
Physiological methods and time-motion analysis have also been evaluated as relevant variables.
Starting from ergonomic reasons, and still related to multifunctional applicability, the degrees of
freedom of the amenity is defined as important including the rehabilitation active phases [39].
Similarly, for biomechanics, flexibility concerns studies do not directly relate to the material
sciences, but rather to the adaptable meaning of the word. Scientific evidence underlines the importance
of its eects and the ability to be used in various contexts [
1
,
40
]. Still, muscle strengthening, actions
(concentric, eccentric, etc.), reactions, the variety of speeds of contractions and muscle recruitments
and all the relations with bone concepts have been assessed, through selected devices, by various
authors reviewed [
36
38
,
40
,
41
]. The initial comparison is often related to exercises carried out with free
Appl. Sci. 2020,10, 1534 9 of 19
weights and, as a more generic definition provided, the workout against supra-normal loads. Findings
reveal that non-electrically powered, yet ‘gravity-independent’ equipment, has similar features to
‘traditional’ equipment known to be eective in producing the desired physiological responses [41].
In relation to the previous feature listed, the quality of usability is mentioned in some studies [
29
,
33
,
38
,
42
,
43
]. The main topics highlight the importance of the final user guidelines and response types,
depending on the type of customer (lately including senior categories) and the operative capacities
when a monitor or display is included in the physical amenity. Other quality variables treated include
the educational aspects for H&F professionals, addressing, for example, the application variables
needed to make the most of the selected products from each manufacturer in their own context (overall
population, population per km2, area in km2, penetration rates, etc.).
Five additional tangible quality parameters have been mentioned in most evaluated publications
in relation to existing products: (1) attractiveness [
4
,
38
], (2) eciency [
17
,
43
], (3) high quality and
experienced design control [
1
,
4
,
42
], (4) functional and practical linearity [
1
,
38
] and (5) specialty and
cost [
30
]. Additionally, three intangible aspects emerged: (1) beneficial [
17
], (2) engagement and
(3) ‘magic moments’ during every use of the fitness apparatus [4].
The analysis continues with the environmental parameters in which the products need to be placed
and begins with a source evaluation [
36
]. The surrounding structure or the external environment is not
aected through unnecessary noise or induced vibrations, especially when the evaluated equipment
does not have a mechanical system included in the hardware parts. These aspects could indicate
the insecurity of the product and cause subordinated issues related to the increase of temperature,
humidity and lighting vibrations [42].
Aside from being one of the most discussed topics, sectoral providers already know the importance
of the overall safety and hazard prevention related to the physicality of the equipments which is
not fundamental only for the health care and rehabilitation applicabilities, but also for the entire
population who daily uses the products [
44
]. Many studies address this topic to the machines final
features [
1
,
17
,
30
,
33
,
38
,
39
,
43
]. Evaluations began from preventive acts to avoid hurts and joint injuries
during utilisation, until touch the comfort in creating a safe fitness ‘experience’.
3.4. Innovation Paths
It is widely accepted that creating quality products and services require a well-trained and skilled
workforce, business strategies and polyfunctional abilities that give momentum to the fitness industry
innovation [
45
]. The factor for successful innovation is not exactly the same for every company [
46
].
Sorting and analysing the individual cases can serve as a basis of reference and act as a guidepost for
other companies in similar industries during their business development. Subsequently, it is possible
to strengthen the enterprise’s capacity in order to accelerate process innovation, reduce dependence
on other economies and develop marketing brand strategies to promote and generate more added
values [28].
To create an attractive fitness brand, an enterprise does not necessarily need innovation products
or services, but something, or someone, with personality and the right preparation to give vitality to
the brand [
12
]. Since quality of life is rising constantly, the fitness industry has developed quickly due
to the high demand worldwide [
47
]. A lack of innovation, in addition to other related factors, such as
product research and technical development, could restrict the number of members which participate
to the delivered course of service practices [
48
]. The innovation activity of a sectoral trader (procedure
inputs/processes outputs) is separated into three phases: motivation, process and performance [
46
].
Through these stages, the enterprise’s competitive advantages and eciencies can be clearly seen.
Thirty years ago, Dibble [
15
] made an observation that represents the current reality and could be
written today with an eye to the future (p. 74):
The fitness industry is far from exhausted [
. . .
] manufacturers seem taking a rational and scientific
approach in designing the next generation of fitness equipment [
. . .
] not satisfied with simple
muscular or cardiovascular improvements they are taking steps toward an intelligent workout that
Appl. Sci. 2020,10, 1534 10 of 19
optimises user’s time [
. . .
] another design target is increased interaction between user and the
equipment [
. . .
] if you can ‘see’ progresses and intensities you will be more inclined to provide an
extra-eort required to correctly complete an exercise”.
Studies have explored seven quality innovation areas desired for a product’s overall growth,
which should be kept in mind: (1) bodily and physiological, (2) tangible corporeality, (3) intangible
corporeality, (4) intangible variables, (5) trade actions, (6) field personnel and (7) final consumer
(Appendices Aand B).
These seven key points, divided along the continuation sub-paragraphs, correspond to the main
fitness equipment facets obtained from the traditional literature analysis performed (product life-cycle
phases and manufacturing key players).
1 Bodily and Physiological
The first quality dimension of H&F equipments is directly related to the human body and its
physiological parameters. These are useful to entirely embrace all that is required to carry out physical
activities through physical amenities.
As noted by Reilly and Lees [
37
], training apparatus has a similar emphasis on exercise specificity,
but not all of its related functionalities are triggered by the required physiological movements. Another
analysed theme is the standardisation of body gestures and all the named kinaesthetic skills [
4
].
Additionally, the structure needed to meet the ergonomic requirements is planned in order to render
the patterns more comfortable for dierent groups of people who will use the equipment [
47
]. Between
the safety qualities, connected to biomechanics, there are the related and required input-admission
measurements [
11
], and body dimensions data useful to categorise the user type [
42
]. The physiological
changes induced by physical activity, such as motion sickness, spatial disorientation, orthostatic
hypotension, muscle atrophy and bone demineralisation, are evaluated by Davis and Davis [36].
2 Tangible corporeality
Continuing to analyse the tangible qualities, required to create new products, is normal to list all
the attributes that appear to the insiders manufacturers view and, as well, to the end-users perception.
Everything that is made under the innovative constructs begins from physical security and
comfort directives [
37
]. Material science has contributed, and will continue to do so, on a large scale
in hitting implements. In addition, strict safety factors are highly demanded at all buyer levels [
42
].
Safety guarantees in the design should decrease accident probabilities. Additionally, the morphologic
semantics shape has been studied. The overall size and structure of the equipments have also been
analysed to create a wider applicability [47].
3 Intangible corporeality
Another important innovation aspect related to corporeality is everything immaterial that can
be directly handled by manufacturers and play a vital role for industry operators and, especially,
end-users. What works best for the success of a product is the innovative design perspective of
hardware and software amenities [
17
,
37
]. For example, an experienced design of the fitness services
brings to the key factor of the ‘lived’ body [
4
]. The logo design of the company has also been included
among the evaluated ‘attributes’ and obtained a rating of 5.83
±
1.02 on a 7-point Likert scale for
purchase decisions [49].
Among the four main factors of industry success there is the ‘mastering technologies’ facet [
46
].
In this regard, companies gain a great chance to extend their business by paying more attention to
technological innovations [
47
]. Combining concepts of modern technology (personal computers,
tablets, etc.) a device is normally perceived closer to the user’s ways of work [11].
Only one study considered the order of methods to conduct energy storage [
11
], and another
study aimed on how IT visions are transmitted vertically and horizontally to the global market [4].
Appl. Sci. 2020,10, 1534 11 of 19
Eects of virtual reality and interactive interfaces have been studied in the user view for adherence,
and to obtain real-time exercise information to check the accuracy [
47
]. Involvement and adherence
have been assessed by two research groups [
50
,
51
], where a virtual reality enhancement exercise
obtained the highest levels of attendance and eects of sensory input, such as music and video feedback,
have been studied by means of computerised attentional focuses (gaze strategy orientations).
4 Intangible variables
All those ‘sensations’ produced by the equipment that are reflected on fitness professionals and,
especially, to the final consumers are an important sphere of innovation which is also covered by all
those non-material-themed aspects (Appendix B).
During their leisure time (when most use fitness equipment), users want to avoid boredom, time
complaints, and more in general need something enjoyment to not impend in reasons of declining
interest [
15
,
51
]. This is often correlated to studies of the areas of emotional and sensational knowledges
and body-related skills [4].
Various psychological variables have been evaluated in relation to fitness devices [
49
,
50
,
52
].
Among these are positive engagement, revitalisation, tranquillity, physical exhaustion, dissociation,
regulated competition, enjoyable experience and all the ‘benefits’ (identification, acceptance, nostalgia,
place pride, etc.). The only article addressing the psychological suggestions related to the product’s
colours is oered by Wang and Gao [42].
5 Trade actions
The final applicability and adaptability of fitness equipment in the environments and international
communities represent the triumph or not of the same. As armed by Guest and Taylor [
53
] regarding
product orientation, success comes to those organisations that oer goods and services considered
‘good’ by the final audience. Eciency of corporate costs, ecient production (phase cycles) and
optimal distribution systems and channels are at the foundation of sectoral armation.
In competitive sport activity contexts, it is already known that bilateral correlation between
specific disciplines and related equipment is not always clear [
37
]. Thus, product’s marketing actions
must be analysed and defined in terms of similarity (or dierences) from other objects that might
occupy the same environment in relation to the sector competitors [
12
,
17
]. Additionally, still connected
to the machinery’s trading, have been assessed corporate revenues and profitability for each created
and moved equipment inside targeted environments [54].
Among the additional guidelines emerged in literature, three are cited: (1) create a clear brand
position [
46
] including themed area contents in relation to health and rehab applications in order to
obtain more hypothetical active consumers [
11
]; (2) dierentiate products and be a smart marketer [
44
];
and (3) study and focus on ‘basic’ application variables such as geographies, cultures, genders, races
and classes [
55
]. The costs of new and innovative product or service development in the global market
have risen, prohibiting the emergence of new brands [12].
6 Field personnel
Behind every device there is a defined multi-area skill force of practitioners, most of them starting
from the employment of diversified talents [44,46].
According to Guest and Taylor [
53
], excluding the assembly, IT, design and engineering
departments, a total of 56% of corporate respondents said that their principal professional background
was in sports and leisure management, followed by administrative or general management at 16%.
For the fitness industry, there is no clear link between competitive strategies, and established skills [
45
].
Among the attributes of the sectoral brand equity there is research evaluating the role of ‘star players’
within companies [49].
Two enterprise case studies provide new approaches ways to develop innovative ideas.
Kennedy-Armbruster et al. [
17
] explain that there is a need for collaborative education models
(translational education) between institutions of higher education and for-profit corporations to create
Appl. Sci. 2020,10, 1534 12 of 19
real personal relationships. Another contribution, facing the company’s personal accountability
and ownership, established a direct connection between employees and sectoral trader’s financial
performances [
54
]. The OZ Principle
®
(Getting Results Through Individual and Organisational
Accountability) encompasses four steps: see, own, solve and do it.
7 Final consumer
After the conception, creation, features applicability and, where possible, innovation, every
product needs an audience by which public demand is generated. Indeed, the ultimate judge of the
adequacy of public sector leisure provision is the customer [53].
Field consumer-based brand equity is defined through 16 reviewed dimensions divided by
attributes, benefits and acceptance [
49
]. Yet, it is equally true that in the way to know one’s potential
consumer, a clear winning choice should be that the companies could study the final consumer
before [
44
]. Contemporary societies do not matter the criteria and paths in which human-machinic
fitness products are nowadays assembled [55].
Enterprises are looking for the real consumer’s feedback from all points of view [
17
]. Generate
maximal attendance and create or increase levels of interaction are the main objectives at this level of
the negotiations [15,50,51].
3.5. Sectoral Environments and Marketing Processes
An important step is to define what has emerged, from the systematic searches in relation to the
final environments in which the featured products normally arrive, and which marketing strategies
have already been studied and performed. These steps logically occur after the creation, featuring and
innovation stages.
The first topic includes the relation between H&F experts and employees, and final consumers [
56
].
The study arms that social marketing approaches in this direction have grown rapidly within
the past 20 years. Aside from the normal skills required by the sectoral sta, nowadays interest in
self-development is needed to provide better and competent services in relation to what is physically
owned. Healey and Marches [
57
] observe that several practitioners are also being trained in disease
prevention, motivational techniques and health care marketing skills to motivate the same employees,
users and their health-related concerns. The fulcrum of marketing models involves the consumer
orientation in product/service development, which is why a wellness program is usually critical in
its first step regardless of the environment in which it is implemented. According to Grönroos [
58
],
the quality of the services, physical or otherwise, is divided into ‘expected’ (ad’s, field selling, public
relations, pricing, traditions, word-of-mouth, etc.) and ‘perceived’ (in which is included the cover
image and connect technical/functional qualities).
The final usage has also been assessed, taking into consideration the financial and access
performances and their relationships [
59
]. A relevant consumer point of view is provided by McKechnie
and colleagues [
60
], who analysed the female market segment (aimed mainly to home fitness devices),
as a viable target for ads claims through in-depth interviews and a specific questionnaire. The
information sought included the type and brand of the equipment in possession, which family figure
bought the device and the reasons that bring to this decision, and, finally, what opined on the future
development of this targeted kind of product. Another investigation interviewed sales managers of
a studied area and acknowledged that customers rarely complain about the overall qualities of the
purchased devices. The types of products included in the analysis were treadmills, cycling machines
and workout (muscle strength) apparatuses, including small abdominal-focus amenities. Almost half
of the final consumer cohort (44%) arm that believe in ads claims, and, of those, 34% confirmed that
their belief in ads messages depends on the origin of the ad. Always facing the sale moments of the
product processes, You et al. [
18
] identified two main phases: the equipment allocation decisions and
the algorithm that determines the sales limits (expected sales numbers for consumers and management
in terms of member recruit limits).
Appl. Sci. 2020,10, 1534 13 of 19
The relationship between a brand’s association and loyalty was studied by Gladden and Funk [
52
]
in relation to professional sports consumers. Results showed ‘positive’ relations with fan identification,
escape, nostalgia, product delivery and loyalty; ‘negative’ with tradition, star player(s) and peer
group acceptance. The commercial sponsorship approach has been analysed in terms of its impact on
purchasing products in relation to a brand’s image and attachment [
61
]. Based on the nature of the
entities involved, the model demonstrates that multiple sponsorships activate three ‘brand behavioural
dimensions’: cognitive, aective and conative. The changes of post-industrial environments, with
a focus on marketing brands, embrace various other influences [
62
]: local traditional value views,
production and distribution globalisation aspects, hierarchical system transition (e.g., when one brand
become sub-brand), the transformation development of family-run management and practices of an
enterprise’s liabilities.
Finally, facing the strategic part of the H&F marketing actions has evaluated the demand
compliance and the supply-led and interactive convergences investigating the interconnection between
the usage of fitness equipment and the related manufacturing industries [
63
]. Findings show that
production establishments were the Granger cause of training on fitness products and, where not,
the opposite relation was confirmed only for supply-led convergence. Nowadays, in this stage of
the industry, fitness providers predict future development tendencies through the main competitors’
product analysis, the innovation provided and price variations [
64
]. Marketing includes: culture,
service, brand allocations and all these variables mixed together. Economic indications are dictated
mainly by social development states of international negotiations within fitness industry.
4. Conclusions
This paper has synthesised the ways in which fitness equipment has been studied in relation to
the life-cycle phases of the product-amenities introduction. Since the beginning of the historical and
visionary milestone ideas, passing through the concrete creation of companies focused on production,
until the ultimate trends that, this modern industry, is nowadays still able to oer. Additional findings
demonstrate how the sectoral enterprise’s path is far from finalised. The goal is still to continuously
introduce innovative routes to train and approach people with new human-machine physical activities.
This traditional review of the available research indicates that there is a literature gap in the way
of ‘white label’ investigations that not merely need to mention, in a specific manner, companies or their
related products. These actions are more common for the parallel physiological research areas, applied
to physical exercise sciences and everything that is instrumental or diagnostic, which are conducted on
fitness, or rehab tools, mandatorily named along the scientific manuscripts. Similar speech could be
done for the same corporate realities that are barely interested in bringing their internal researches
to academic scopes, and limit their own marketing analysis to private procedures, aimed only at
‘defending’ themselves from external/peer competition.
The five key points identified do not stand alone because an inter-relationship is evident that
combines each of these steps. For the historical roots is undoubted that, the encountered nods, could
represent only partially the complete atmosphere that stood from the late-19th century and the 20th-21st
centuries. The opinions included have been the only that match the criteria initially established for
the literature analysis. Going forward, the review illustrates that, regardless of the production areas
analysed, several quality product features correspond with each other. For this reason, it is possible
to confirm that the guidelines provided by the literature (and for this, is supposed, that have been
already followed by the named manufacturing realities) could be considered valid and, moreover,
viable in the coming decades given the increase in demand/purchase actions of fitness equipments at
international levels.
Firstly, this review indicates that local support, which is already in the possession of the final
investors and users, is fundamental. This needs to be ‘ready to use’ and applicable for every consumer
group, or professional, who needs to interface with the amenity and deserves to enclose the right
balance between corporeality and the accompanying software services (where included). Secondly,
Appl. Sci. 2020,10, 1534 14 of 19
understanding the evident lack of specific-themed equipments applicable to each sport discipline
outside the fitness area, the current study argues that there is a necessity to develop products that
could be more useful (and permit these customers to feel more the inclusiveness) for this population
of already focalised athletic individuals (specific movements, fewer hardware barriers, wearable
connectors, etc.).
The geographic areas that did not emerge in the review, or at least were less cited by the selected
sources, could correspond to where less products are entirely or partially developed. No academic
publications are available in supporting this quote, but within the sector it is well known that the
fitness industry leaders are located mainly in North America and Europe [
6
]. At the same time, this
may inform understanding that, with the advent of the new century, companies also locate their
headquarters in countries with potential internal development (e.g., Far East, Middle East, Latin
America), and not only for classic reasons of cushioning costs in producing, rather than in places
labelled as more saturated. Academic contributions are, for this reason, waited in the future also by
these ‘fresh’ fitness environments. This could mean taking into account a mix of cultural, economic,
political and social aspects that shape these focused processes.
It is argued that pure management and marketing approaches are still weak for those study areas
not included in home fitness equipment or hospitalities (hotels, etc.). These ‘extra slices’ are still at
the foundation of labour-routine of sectoral sales force (B2B level), but are less assessed in academic
literature. Interesting variables could be the range of products available, geographical distribution and
its related information, and details intersected to the disposable society to which actions are directed.
This could provide information on additional variants that could be investigated to why a specific
amenity is considered suitable for a determined market segment or not.
Limitations and Recommendations
Authors acknowledge both strengths and limitations to the approach adopted for reviewing and
analysing the existing evidence.
The main strength from this traditional literature analysis is the level of flexibility oered by our
approach. This enabled us to include a wide variety of information without being impeded by strict or
inappropriate inclusion/exclusion criteria. Moreover, the iterative approach allowed us to refine the
analysis based on newly discovered material.
Among the limitations of this review, the initial problem was the large number of published
licenses and patents related to the products registered worldwide that also appear in academic
databases and were discarded because of the content’s irrelevance. In addition, secondary searches
were carried out, according to the same evaluation methods with the common synonyms used in the
publications for the key words selected (provided in alphabetical order):
Equipment: accessory, device, good, instrument, item, hardware/service amenity, machinery,
machine, object, quality physical material, product, system, tool, etc.
Company: brand, concern, corporation, enterprise, entity, industry, provider, sectoral trader, etc.
The subjectivity of the authors was inherent within the process. This approach means that the
review’s quality depends upon the review team’s skills, like in other methods of investigation. The main
ability has been weave together the relevant material in a systematic and logical way. Nevertheless,
we believe that the adopted approach is the most suitable way to fulfil the purpose of this research
given the current state of the sub-field analysed, as well as for the volume of material included in the
investigation. A final limit is the number of databases used and the keywords selected, which could
have been expanded to include more scientific supports.
Further investigation approaches could focus their analyses on a specific product-phases or, at
the same time, on how various steps, highlighted in this contribution, are correlated to those which
are definable as more proximal (e.g., ‘featuring’ with ‘creation’ -pre- and ‘innovation’ -post-), with
all the includable scientific variables assessable. Or, maybe, include only a specific type of the most
commercial fitness equipment models (treadmills, strength-isotonic amenities, etc.) available in a
Appl. Sci. 2020,10, 1534 15 of 19
specific market segment, or simply dictated by the trend of the moment in which the analyses are
carried out.
‘Theoretical to practical’ implications, which could be directly transposed to the current fitness
industry and its players at all levels (manufacturers, B2B, B2C, etc.), correspond to the outcomes
retrieved in each part of the human-machine product life-cycle assessment obtained: from the design,
stepping through the overall featuring development, until the eective innovation provided in all
material and non-material results which reaches the correspondent sectoral population of ‘devotees’.
Especially for this last process of field renovation, the polyhedral approach in terms of themes sorted
demonstrates that this industry need a wide variety of practitioners which could work at unison in the
same direction.
Acknowledging all the inter-relationships between the stages needed to produce fitness equipment
and all the applications carried out by the related manufacturing companies will be an important first
step for those who want to understand the complexity of this interesting fitness industry sub-sector for
further academic investigations.
Author Contributions:
Conceptualization, S.A.; Formal analysis, S.A.; Investigation, S.A.; Methodology, S.A.;
Project administration, S.A.; Supervision, L.G.; Validation, J.G.-F. and J.G.-U.; Visualization, J.G.-F. and J.G.-U.;
Writing—original draft, S.A.; Writing—review & editing, S.A. All authors have read and agreed to the published
version of the manuscript.
Funding: This research received no external funding.
Conflicts of Interest: The authors declare no conflict of interest.
Appendix A
Resume of Selected Articles on Specific Product Features and Qualities
Product Features and Qualities Author/s (Year)
Action flexibility Berg and Tesch (1998); Davis and Davis (2012); Kang et al. (2013),
Reilly and Lees (1984), Reilly and Thomas (1978), van Hilvoorde (2008)
Anthropometric, biomechanical and
physiological parameters
Davis and Davis (2012), Kreighbaum and Smith (1996), Lee (2008),
Long et al. (2009), Parviainen (2011a), Reilly and Lees (1978), Reilly
and Thomas (1984), Teng et al. (2014), Wang and Su (2012), Wang and
Gao (2013)
Applicability and usability
Burton and Human (2007), Kreighbaum and Smith (1996),
McComack (1999), Reilly and Thomas (1984), Steen-Johnsen and
Kirkegaard (2010), Wang and Gao (2013), Wang and Su (2012), Yoon
and Ahn (2015)
Brand (attachment, equity, position
and vitality)
Gladden and Funk (2001, 2002), Chavanat et al. (2009), Parviainen
(2011b), Ren (2007), Williams et al. (2014), Yuan et al. (2009)
Color Wang and Gao (2013)
Corporate educational models Kennedy-Armbruster et al. (2011), Takaki (2005)
Corporate revenue and profitability Takaki (2005)
Design control
Gladden and Funk (2002), Kennedy-Armbruster et al. (2011),
Kreighbaum and Smith (1996), McKechnie et al. (2007), Parviainen
(2011a), Reilly and Lees (1984), Wang and Gao (2013)
Economical specialty Teng et al. (2014)
Emotional and sensational knowledge Parviainen (2011a)
Appl. Sci. 2020,10, 1534 16 of 19
IT and virtual reality Yuan et al. (2009), Long et al. (2009), Wang and Su (2012),
Parviainen (2011a)
Linearity Reilly and Thomas (1978), van Hilvoorde (2008)
Safety and comfort practices
Burton and Human (2007), Kennedy-Armbruster et al. (2011), Lee
(2008), Parrot (1996), Reilly and Lees (1984), Reilly and Thomas (1978),
Sekendiz et al. (2016), Teng et al. (2014), van Hilvoorde (2008), Wang
and Gao (2013), Yoon and Ahn (2015)
Size and mass (structure) Davis and Davis (2012), Long et al. (2009)
Source type and energy storage Davis and Davis (2012), Wang and Su (2012)
Temperature, humidity and light Wang and Gao (2013)
Appendix B
Resume of Selected Articles on Induced and Transmitted User’s Eects
User Eects (Induced or Transmitted) Author/s (Year)
Attractivity Parviainen (2011a), Reilly and Thomas (1978)
Beneficial Kennedy-Armbruster et al. (2011)
Eciency Kennedy-Armbruster et al. (2011), Yoon and Ahn (2015)
Engagement Annesi and Mazas (1997), Parviainen (2011a)
Enjoyment Dibble (1989), Mestre et al. (2011)
Interaction (on attendance) Annesi and Mazas (1997), Dibble (1989), Mestre et al. (2011)
Involvement (on adherence) Annesi and Mazas (1997), Mestre et al. (2011)
Physical exhaustion, regulated competition
and revitalization Annesi and Mazas (1997)
Appendix C
Resume of Selected Articles on Named Companies (or Services) on Geographic Basis
Authors (Year) Country Named Company/Ies or Workout Concepts
Annesi and Mazas (1997) US DiamondBack Fitness, Tectrix
Berg and Tesch (1998) Sweden Flywheel
Burton and Human (2007) US Concept2, Cybex International Inc., FitLinxx, Life Fitness
(Brunswick Corp.)
Dai (2014) Japan Asics, Mizuno
Dibble (1989) US
Belton, Cybex International Inc., Hydra-Fitness (Hydra-Gym
Athletics), Life Fitness (Brunswick Corp.), Nautilus Inc., Precor
Inc., Reebok, StairMaster (Randal Sport/Medical), Universal
Kang et al. (2013) South Korea Biodex Inc.
Kennedy-Armbruster et al. (2011) US Johnson Health Tech. Co., Ltd. (Matrix branch)
McCormack (1999) UK NordicTrack
Parviainen (2011a) Finland Les Mills Int.
Parviainen (2011b) Finland Putkisto’s Method (stretching, pilates and face school)
Reilly and Lees (1984) UK Cybex International Inc.
Sekendiz et al. (2016) Australia Cybex International Inc., Johnson Health Tech. Co., Ltd.
(Matrix branch), Life Fitness (Brunswick Corp.), Nautilus Inc.
Takaki (2005) US Precor Inc.
Yuan et al. (2009) Taiwan Johnson Health Tech. Co., Ltd. (general)
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