1Department of Kinesiology and Health Studies, Southeastern Louisiana University, Hammond, LA, USA 2Fitt House, Baton Rouge, LA, USA
Corresponding Author:
Edward Hebert
SLU Box 10845
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Hammond, LA 70810
ehebert@selu.edu
985-549-2132
Edward Hebert, PhD is a Professor of Kinesiology at Southeastern Louisiana University. His research interests include exercise motivation and adherence, and applied research in motor learning.
Jada McGuin, MS is a fitness professional and the Owner/Operator of The Fitt House in Baton Rouge.
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ABSTRACT
This study describes attitudes of adult exercisers toward female and male personal fitness trainers, and compares responses of male and female, younger vs older exercisers, and those with varying levels of exercise experience. Recruited from 4 fitness gyms, 201 adults aged 18 to 77 completed an anonymous survey where they provided relative attitude ratings toward female vs. male fitness trainers specific to the trainer’s knowledge, helping meet personal fitness goals, following their directions, comfort discussing struggles with exercise, working with the trainer for an extended time, and referring others to them. Participants rated male trainers higher for fitness knowledge, and were more willing to follow their directions, work with them for an extended time, and refer clients to them, but perceived a female trainer more favorably for discussing their struggles with exercise. Significant gender, age, and experience differences were found. Gender-biased perceptions were highest among male, older, and inexperienced exercisers, who had more positive attitudes toward male fitness trainers. Attitudes of women, younger, and experienced exercisers tended to be more neutral, and favor female trainers for meeting personal goals and discussing struggles. The results of this exploratory study suggest gender-biased exercise attitudes are influenced by participant gender, as well as age and experience, and provide impetus for additional research on exercise attitudes.
Keywords: personal training, beliefs, perceptions, biases
INTRODUCTION
Recent decades have seen a great expansion of the fitness industry signaled by an increase in the number of adults exercising in fitness centers around the world. This rise has been attributed to a number of factors including global recognition of the benefits of physical activity, endorsement of exercise by the medical community, and growth of the fitness industry (1, 23). Yet, exercise adherence remains problematic (30, 32) and fitness clubs tend to have low retention rates (23). The practice of exercising with a personal fitness trainer (PFT) has increased in popularity and personal training has become a standard feature in many settings (5, 21, 23, 33). PFTs design and supervise exercise programs, and help clients set and reach personal goals. In addition, they engage in practices to promote an active lifestyle, motivate clients, and facilitate their exercise competence and self-efficacy, which can play an important role in exercise adherence (23, 29, 33). Studies of consumers consistently identify a fitness club’s staff, and fitness leaders’ instruction, feedback, and support as among the most important factors in customer satisfaction (15, 27). In addition, satisfaction with individualized training is positively associated with exercise motivation and self-efficacy (33). Consistent evidence points to the benefits of exercising with a PFT. Studies show that individuals who train with a PFT are more likely to attend exercise sessions and adhere to programs (2, 12, 18, 26). Those who train with a PFT have been found to exercise at higher intensities (25, 31) and make greater strength and fitness gains (24, 25) than those who exercise independently. These results are similar to findings comparing individuals who train alone vs. under the supervision of a fitness professional (9, 14).
Studies of fitness settings have often concluded that gender plays a role in gym-related attitudes and behaviors. In their review, Håman et al. (16) suggested fitness gym spaces are strongly associated with male bodies and norms, and gender norms influence social practices and behaviors there. Exercise motivation has been tied to weight loss for women and enhancing muscularity among men (20). Certain types of exercise are considered masculine or feminine, and exercisers have been shown to use gendered language to refer to areas of the gym (7). Interview-based studies of PFTs indicate that a clients’ gender influences their advice (16) and they recognize that gender plays a role in clients’ selection of a trainer (29).
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The results of previous interview-based studies (21, 28) indicated that women prefer a female PFT. This preference is based on perceptions of being less self-conscious about their bodies with a female trainer, and the beliefs that a female trainer would better understand and empathize with their struggles with exercise and comfort levels in the gym. Survey-based research comparing perceptions of male and female fitness trainers have studied the attitudes of college students, and produced mixed results. In their study of 402 undergraduates, Fisher et al. (13) found no clear preference for a male or female PFT, yet hypothetical female PFTs received higher ratings for general perceptions of competence, and participants’ willingness to discuss progress and take instructions/corrections from them, compared to male trainers. Boerner et al. (5) similarly found that college undergraduates perceived female PFTs as more competent and knowledgeable than males. However, male students preferred to work with a male fitness trainer, while female students had no gender preference. Similarly, Magnusen and Rhea (22) found female college Division I athletes had no preference for a male or female strength coach, whereas males preferred a male coach.
Thus, research to date on attitudes toward male vs. female PFTs has provided mixed results, and survey-based studies to date have exclusively examined perceptions of college students, which may be different from non-college aged adults. In addition, research has yet to examine how attitudes toward male/female fitness trainers may vary with other potentially-influential factors such as age and exercise experience. Thus, the purpose of this exploratory study was to examine attitudes toward male and female PFTs in a sample of adult members of fitness gyms, and compare responses with respect to participant gender, age, and exercise experience.
METHODS
Participants
Participants were 201 (144 female; 57 male) adult members of four fitness centers from one city in the southeast United States who responded to an online survey. They ranged in age from 18 to 77 years (mean = 35.87, SD = 14.87 years). Self-reported experience levels were Beginner (n=59), Intermediate (n=91) and Advanced (n=51). Over half of the sample indicated exercising four or more times per week (54.9%), with 25.3% indicating three times per week, and 20.1% once a week. Table 1 provides the number and percent of male and female participants in age and exercise experience groups.
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Procedures
Prior to data collection, the study was approved by the Institutional Review Board of the authors’ university. Participants were recruited from fitness centers via email with the cooperation of the managers. Two facilities were small gyms that offered only individual and small group training, and two were larger traditional fitness centers that housed a variety of equipment and amenities, and provided personal training services and group exercise classes as well as independent exercise. A recruiting email with a link to an anonymous online survey was sent to all members of the two small gyms, and members of the larger gyms who had expressed interest in personal training. Participants were assured of anonymity and informed their participation was voluntary and they were providing consent to participate by completing the survey.
Data were collected using a survey created for the study. Survey items were based on and relatively similar to those used in previous research on attitudes toward female/male fitness trainers (13). Item content was guided by previous research examining criteria for selecting a PFT (16, 23, 29) and on reasons people may prefer a male/female PFT (21, 28). After initial development, the survey was reviewed by researchers with expertise in fitness who provided feedback and recommendations.
The first section sought demographic information including gender, age, level of fitness experience (beginner, intermediate, or advanced), and frequency of exercise during the last month. The next section focused on participant’s attitudes about working with a PFT, specifically how their attitudes would be influenced by the trainer’s gender. It included 6 face-valid items: (1) “My belief about the trainer’s knowledge about fitness,” (2) “My belief in the trainer’s desire for me to meet my personal fitness goals,” (3) “My willingness to follow the trainer’s directions about exercise,” (4) “My level of comfort discussing my struggles with exercise with the trainer,” (5) “My willingness to continue working with the trainer for an extended length of time,” and (6) “My willingness to refer clients to the trainer.” Participants responded to teach item on a 5-option scale: Higher for a female trainer, slightly higher for a female trainer, the same for a female or male trainer, slightly higher for a male trainer, or higher for a male trainer.
Data Analysis
For data analysis, ratings were translated to a numerical scale from -2 to 2 with the neutral response in the center: (-2) Higher for a female trainer), (-1) Slightly higher for a female trainer), (0) The same for a female or male trainer, (1) Slightly higher for a male trainer, and (2) Higher for a male trainer. Responses were also coded categorically as neutral, or favoring a male or female trainer. Descriptive statistics (mean, standard deviation, and percent of responses indicating a neutral response or favoring a female/male PFT) for responses to each item are reported for the entire sample.
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Responses were also analyzed with respect to three independent variables (gender, age group, and fitness experience). Three levels of fitness experience were self -reported Beginner, Intermediate, and Advanced. For the purpose of the study, participants were divided into two age groups operationally defined as younger (18-39 years) and older (40 years and older) exercisers. Numerical responses were analyzed using three separate MANOVAs with the 6 survey items as dependent measures. Significant main effects were further analyzed using independent t-tests or one-way ANOVA. Partial Omega Squared (ηp2) and Cohen’s d were reported as indicators of effect size. In addition to these analyses, the percent of participants whose responses were neutral or favored a male or female PFT were reported for groups.
RESULTS
As shown in Figure 1, as a whole, participants tended to have higher ratings of male PFTs relative to fitness knowledge, willingness to follow their directions, working with the trainer for an extended time, and referring clients to them. However, they tended to perceive a female PFT more favorably for discussing their struggles with exercise. The percent of responses that were neutral or favored a male/female trainer yielded similar patterns. Overall, more people indicated positive attitudes toward a male than a female PFT for expectations of fitness knowledge (31.3% vs. 5.5%), as well as willingness to follow the trainer’s directions (29.9% vs. 10.9%), working with the trainer for an extended time (20.9% vs. 11.9%), and referring other clients to the trainer (17.4% vs. 5.5%). For comfort discussing struggles with exercise, 41.8% indicated a preference for a female trainer with only 24.4% preferring a male trainer. For most items, 50-60% of participants indicated a neutral response (the same for a male or female trainer), with the exception of comfort discussing concerns for which only 33.3% indicated no preference.
Attitudes of Male and Female Respondents
As shown in Figure 2, responses of male and female exercisers showed clear gender differences. Mean values indicated men rated a male PFT higher than a female PFT for all items. By comparison, female exercisers’ responses tended to vary more across items, and average responses were near neutral for several items. The MANOVA indicated significant differences between male and female respondents were present [Wilks’ Lambda=.845, p<.001>ηp2=.16]. Follow up comparisons indicated significant differences for four items: expectations for the trainer to help meet personal fitness goals [t(199)=4.20, p<.001 cohen="">d=1.14], willingness to follow the trainer’s directions [t(199)=2.71, p<.01 cohen="">d=1.00], comfort discussing exercise struggles [t(199)=5.24, p<.001 cohen="">d=1.24], and willingness to work with the trainer for an extended time [t(199)=2.01, p<.05 cohen="">d=.93].
Gender-biased patterns were also evident in the percent of ratings which were neutral vs. favored a male or female PFT (see Table 2). A higher percent of male exercisers indicated they would be more comfortable discussing their struggles with a male (43.9%) than a female trainer (17.5%), whereas female exercisers indicated a preference for a female (51.4%) over a male PFT (16.9%). A similar same-gender preference was indicated for perceptions of the trainer’s desire to help meet personal fitness goals, and working with them for an extended time.
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Attitudes of Younger vs. Older Exercisers
Older exercisers (aged 40 and over) tended to favor a male PFT for all items, whereas younger exercises (18-39 years) had more varied responses and were near neutral for several items (see Figure 3). Responses were found to vary significantly by age group [Wilks’ Lambda= .884, p<.05>ηp2=.06]. Follow-up comparisons indicated significant differences for two items: meeting personal goals [t(197)=2.88, p<.01 cohen="">d=0.45], and discussing struggles [t(197)=3.18, p<.01 cohen="">d=0.49]. As indicated in Table 3, for these items, older exercisers tended to have either neutral attitudes or favor a male trainer, whereas younger exercisers more often favored a female trainer.
Variation as a Function of Exercise Experience
Mean scores for individuals varying in exercise experience are shown in Figure 4. The MANOVA comparing responses was significant [Wilks’ Lambda=.839, p<.001>ηp2=.08]. One way ANOVA follow-up comparisons indicated a significant difference for only one item: expectations for the PFT’s knowledge [F(2,198=7.14, p<.001 wp_automatic_readability="65.478938906752">ηp2=.086]. Post-hoc Student-Newman-Keuls comparisons indicated beginning exercisers had significantly greater expectations of fitness knowledge for male trainers (p<.05 whereas="" knowledge="" expectations="" of="" male="" vs.="" female="" trainers="" were="" similar="" for="" exercisers="" with="" intermediate="" or="" advanced="" experience.="" examination="" response="" percentages="" shows="" a="" clear="" pattern="" reduced="" gender-bias="" as="" exercise="" experience="" increased.="" example="" only="" beginner-level="" indicated="" trainer="" to="" help="" them="" meet="" personal="" goals="" would="" be="" the="" same="" but="" this="" neutral="" rating="" increasing="" and="" exercisers.="" higher="" was="" observed="" all="" items.="" wp_automatic_readability="130.95742329693">
DISCUSSION
Research supports the benefits of exercising with a PFT (2, 12, 18, 24, 25, 31), and evidence suggests that gender plays a role in exercise attitudes and behaviors, including selection of a trainer (16, 29). Previous survey-based research on attitudes toward male and female PFTs have studied undergraduate students; attitudes of adult fitness center members have not been investigated. An additional limitation of existing research is the failure to examine variables that may play a role in these attitudes. This study examined attitudes toward male and female PFTs among 201 adult fitness center members. Perceptions were reported for the entire sample, and analyzed relative to participant gender, age group, and exercise experience.
As a whole, more participants favored a male over a female trainer for expectations of fitness-related knowledge, willingness for follow the trainer’s directions, working with the trainer for an extended time, and referring other clients to them. However, adults tended to be more comfortable discussing struggles and concerns with exercise with a female trainer. Fisher et al. (13) similarly reported college students had a more positive attitude about discussing progress with female than male trainers.
Age Differences
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Our results showed age-related attitudinal differences. Specifically, older exercisers favored a male PFT, whereas younger respondents favored a female PFT primarily with respect to two items: assistance achieving personal goals and discussing exercise-related struggles. These findings are different from those reported in studies of college students, who overall, viewed female PFTs as more competent and knowledgeable than males (5, 13). Thus, these age-related attitudinal differences may be one of the more notable findings of this study, and may reflect changes in broader gender role-related attitudes among generations (8, 11).
Differences among Male and Female Exercisers
Comparisons between the responses of male and female exercisers revealed two important findings. First, men rated a male PFT higher than a female PFT for all items, while female exercisers’ ratings were more neutral. This is consistent with previous research on college students (5) and Division I university athletes (22) that indicated males preferred to work with a male PFT or strength coach, while females had no clear preference. Second, large and significant differences were observed between responses of men and women for several attitudes including those associated with knowledge, help meet personal goals, following directions, discussing concerns, and working with the trainer for an extended time. While men rated a male PFT higher for all items, women had more favorable perceptions of female PFTs for two specific items: discussing their struggles with exercise, and expectations regarding the trainer’s desire to help them meet personal fitness goals.
These findings align favorably with the results of previous interview-based studies indicating that women who choose a female PFT attribute this decision to beliefs that a female would have a greater empathy for them, and a better understanding of their bodies, struggles, and comfort levels (21, 28). These findings are also consistent with gender-preference research in healthcare. Drummond et al. (10), for example, found that college athletes felt more comfortable when provided care by an athletic trainer of the same gender, and a same-gender healthcare provider preference has been found for physicians and nurses when interactions are of an intimate nature (6, 19). When providing reasons for a healthcare provider of the same gender, women indicate it is due to comfort levels discussing problems and the perception that a female provider will take more personal interest in them (19).
Experience as a Mediator of Gender-Bias
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We also examined attitudes toward male/female PFTs as a function of exercise experience, and used self-ratings as the basis for group formation. Comparisons indicated that, as exercise experience increased, gender-biased ratings decreased. Among beginning exercisers, 37% indicated their expectations for a PFT’s knowledge was neutral (the same for a male or female), whereas 65% of intermediate and 90% of advanced exercisers indicated so. This pattern of increasing gender-neutrality with exercise experience was observed for all items. These results suggest that gender-biased attitudes toward male/female PFTs may reduce with experience. This interpretation is consistent with the ideas that, while fitness-based attitudes and practices are influenced by gender norms and expectations, they are not fixed, but are fluid and can be changed with experience (3, 4, 16).
CONCLUSIONS, LIMITATIONS, AND DIRECTIONS FOR FUTURE RESEARCH
The results of this study indicate that many adult exercisers have gender-biased perceptions of PFTs with higher expectations for a male trainer’s fitness-based knowledge, and willingness to follow a male trainer’s directions and refer clients to him, yet are more comfortable discussing their struggles with a female trainer. Consistent with prior research on college students, these attitudes vary with participant gender. Men had stronger preferences for a same-gender PFT than women did, yet many women tended to favor a female PFT for interest in their personal goals and discussing their struggles and concerns. In addition, potentially important findings from this study are that gender-biased attitudes varied by age and exercise experience. Further research examining how these and other factors and experiences influence gender-referenced perceptions of fitness and fitness professionals is warranted, as is extending research on fitness-related attitudes beyond that of college students.
Previous research on this topic (5, 13) has primarily surveyed convenience samples of undergraduate students whose participation and experience in exercise was unknown, whereas participants in this study were adult fitness center members primarily between 20 and 39 years of age, most who identified as having intermediate or advanced exercise experience, and who exercised 3 or more times a week. Thus, the findings of this study may be more generalizable to typical adults who exercise on a regular basis. However, it should be acknowledged that, while data were derived from a sample of adults from multiple fitness centers, all gyms were from the same region of the U.S., and respondents were primarily female. Age-related differences were examined among two groups with an arbitrary dividing point. Thus, future research on this topic using more varied samples, more adult males, among varying age groups, and additional potentially influential variables is recommended.
APPLICATIONS IN SPORT
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Fitness professionals should recognize that gender plays a role in exercise attitudes and behaviors, including the selection of PFTs and exercise leaders to work with. Data from this study highlight specific beliefs that may play a role in PFT preferences, and how these preferences vary with exerciser’s gender, age, and level of exercise experience. As a result, fitness professionals can strive to behave and communicate in ways that both support clients’ preference, but also seek to overcome biases that may exist.
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You might know Chris Pontius as ‘Party Boy’ from the Jackass films and TV series that defined the early 2000s. Now 51, he’s back on our screens for Jackass: Best and Last, the fifth and final instalment in the franchise. Away from the stunts, though, Pontius has also become an unlikely source of practical fitness advice, regularly sharing workouts from his home gym.
In a recent Instagram Reel, he shared: ‘I have a very simple exercise tip for people who are having trouble getting motivated to exercise. Just lift the weight one time, do one rep, one push-up, whatever it is, and once you’ve started you kind of go, “Well, I might as well just keep going”.’
‘So try it, it’s worked for me every time and it’ll probably work for you,’ he says.
The advice is grounded in behavioural science. By taking one small step towards your workout, you’re more likely to overcome the initial mental resistance because the task feels more achievable. Once you’ve started, it’s far easier to build momentum and complete the rest of your session.
Our Fitness Director Explains Why This Method Works
‘There’s a bit of science behind this, too,’ says Andrew Tracey. ‘Behaviour-change researchers have looked at “all-or-nothing thinking” around exercise – basically, the idea that if you can’t do the full session, exactly as planned, you may as well sack it off completely. Giving yourself permission to do the smallest possible version of the workout is a way around that.
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‘Tell yourself you’re only doing the warm-up. Or one round. Or five minutes. You’re allowed to stop there. But often, once you’ve started, you realise the hard part wasn’t the workout itself. It was getting going. Research also shows that the way a workout feels can affect whether you come back for more. So a small win that feels doable is almost always better than the perfect session you never start. So while the “minimum dose” might feel like a cop-out, it could actually be a way in.’
If there’s one thing Kori Sampson knows, it’s how to optimise your body composition for performance. To tap into his knowledge as an elite athlete and coach, we asked him to create a 4-week plan to help you move faster, recover quicker and keep pushing when the fatigue sets in – all while improving your muscle-to-fat ratio.
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“Forget living longer, exercise can make life easier right now”—a 72-year-old fitness influencer and marathon runner shares two accessible ways to start moving
Retirement is often a time when people slow down, but in Christine Hobson’s case, she’s speeding up. When her daughter persuaded her to join a running club so she wouldn’t get bored, she had no idea she’d get the fitness bug and run 125 marathons in total, visiting all seven continents.
And the 72-year-old former teacher has plans to run the North Pole marathon in 2027.
Hobson, who believes that exercise is the best anti-aging hack, tells Fit&Well: “I think what makes you old is not doing anything and just being sedentary, sitting around watching TV all the time. I really believe the less you move, the less you’re able to move, so when I retired at almost 61, I decided that my new job was to get fit.
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“Aging isn’t just about age—if you make life easier now, the future will look after itself,” she says.
Hobson, who strength trains too, has since become a fitness influencer, amassing over 132,000 followers on Instagram, where she shares workouts and her thoughts on exercise.
“I get loads of messages from people who are scared to exercise because they don’t want to fall over and get injured,” she says. “But getting stronger builds your confidence and means that you can do the things you want without needing help. It’s not about living forever. And it’s never too late to start. You’ve got to start from where you are.”
Here shares her two best tips for getting started with fitness, whatever your age.
Start your week with achievable workout ideas, health tips and wellbeing advice in your inbox.
1. Perform the sit-to-stand exercise
Hobson says an essential exercise to incorporate into your day is the sit-to-stand—a move that involves sitting and standing up from a chair without using your hands.
To build your strength, Hobson suggests doing the sit-to-stand 10 times each time you walk past a chair in your house. Once you’ve got the technique, she recommends trying it from a lower chair or couch to make it more challenging.
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“The sit-to-stand is critical,” says Hobson. “If you can do that, that’s the thing that’s going to keep you independent in your own home. Because if you live alone and you can’t get up, then how are you going to look after yourself independently? The next thing will be that you can’t get out of your bed, and then you’re in trouble.”
Hobson began with the sit-to-stand exercise, and has progressed to squat with a 35kg barbell and deadlift 75kg.
Many people think motivation will just appear, says Hobson, but she says: “There’s no such thing as motivation really. It’s discipline. It’s building a habit. You’ve got to book your workouts in like a meeting at work, which is what I did when I retired. I prioritized fitness like a job.
“I also have my workout clothes ready to make sure I exercise—even if I’m planning to do it later in the day. I get dressed so I can’t talk myself out of it.”
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2. Walk a mile a day
If you’re totally new to exercise, or returning after a long break, Hobson says walking is an excellent place to start.
“We are a species that is supposed to move, and even a short 20-minute walk will support your heart, your ability to control your blood sugar levels, and help you mentally and physically,” she says.
Her trick is to listen to audiobooks while she walks to encourage her to go further.
“This is how I started before I ran my first marathon,” she says. “I walked a mile a day and I really forced myself to do it come rain or shine. After about five or six weeks I found that I wanted to go more.
“And one of the things that helped was listening to audiobooks. If I got home and I had got to an exciting bit in the book I would have to go back out again to hear the next chapter so it would make me walk a bit further.”
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Hobson describes herself as a run-walker, saying she has completed all her marathons that way. “I started exercising for something to do when I retired. Now I do it because it makes life easier.”
CrossFit means a lot of things to a lot of people – because it’s made up of a lot of things.
Since the rise of the fitness giant, countless brands, events and training methods have sprung up around it – not claiming to be CrossFit, but looking suspiciously CrossFit-esque.
There are, however, a handful of things that are uniquely CrossFit: the ‘Girls’ benchmark workouts. The Hero WODs and, of course, its signature rep schemes.
Chief among them is ’21-15-9′.
The 21-15-9 rep scheme may just be the single most CrossFit thing in existence. But what exactly is it? Where did it come from? And why might it actually be better at building muscle in a hurry than its conditioning roots would have you believe?
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Let’s have a look.
What Is 21-15-9?
If you’ve never encountered it before, the format couldn’t be simpler. Choose two exercises (occasionally more) and perform 21 reps of each, then 15 reps of each, then nine reps of each, completing the entire workout as quickly as possible – with good form.
Probably the best-known example is ‘Fran’: 21 thrusters and pull-ups, followed by 15 of each, then nine. On paper it doesn’t look especially intimidating. In practice, it’s one of the most feared benchmark workouts in fitness.
Where Did it Come From?
Unlike many modern training methods, 21-15-9 didn’t come out of a study. It came from the gym floor.
CrossFit founder Greg Glassman has explained that the format emerged through years of coaching and experimentation in the 1990s. Rather than chasing a perfect sets-and-reps prescription, he was looking for a workout that allowed athletes to maintain a high power output from start to finish.
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The thinking is surprisingly elegant. You begin with 21 reps while fresh. By the time you reach the set of 15, your ability to produce force has already fallen. By the final nine, you’re significantly more fatigued – but the workload has dropped by almost the same amount.
Instead of grinding through increasingly miserable sets of the same length, the workout ‘meets you where you are’, reducing the work required as your capacity declines. The result is a workout that encourages you to keep moving instead of standing around trying to recover.
The numbers themselves are also remarkably practical. Forty-five total reps per movement provides plenty of training volume without turning the session into an endurance slog, while every set divides neatly into thirds if you need to break it up.
(Although I’ve got to be honest, I’m a 20-15-10-5 man myself, just for the sake of round numbers.)
Why Does it Work So Well?
Although there isn’t research showing that 21-15-9 is somehow the magic formula, there are obvious reasons why it consistently produces brutally effective workouts.
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Descending reps help maintain intensity. As fatigue accumulates, reducing the target allows movement quality, bar speed and overall work rate to stay higher than they would if you simply repeated the same number of reps over and over.
It also tends to land in a physiological sweet spot. Most 21-15-9 workouts take between three and eight minutes, depending on the movements and the athlete. That’s long enough to create a serious cardiovascular challenge while still requiring meaningful force production throughout. You’re taxing your anaerobic systems hard while relying on your aerobic system to help you recover just enough to keep going.
Finally, there’s the psychological trick. The hardest-looking part comes first. Once you’ve survived the opening 21, every remaining round appears more manageable. ‘Only 15 left.’ Then, ‘Just nine.’ In reality, you’re becoming more fatigued with every rep, but the shrinking target keeps you attacking the workout instead of pacing too conservatively.
Why it Might be Surprisingly Good for Building Muscle
Perhaps the biggest misconception about 21-15-9 is that it’s ‘just cardio with weights’.
Choose the right load and something interesting happens. Very few athletes complete every round unbroken. Instead, the workout naturally evolves into a series of short, broken sets separated by only a few seconds of rest.
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Your 21 might become 11-5-5. Your 15 becomes 8-4-3. Your final nine might stay unbroken – or become 5-4.
In effect, you’ve accidentally turned the workout into a form of rest-pause training.
Those brief pauses allow just enough recovery to squeeze out more high-quality repetitions before fatigue catches up again. By the latter stages of each mini-set, you’re repeatedly working very close to failure, recruiting the high-threshold motor units with the greatest potential for muscle growth.
It’s a similar principle to rest-pause training, myo-reps and cluster sets: all methods used to accumulate hypertrophy-friendly volume while keeping the load relatively heavy and the rest periods brutally short.
You’re basically speed-running a large number of hard, growth-stimulating reps in a very small window of time. Could this help explain why elite CrossFit athletes often carry an impressive amount of muscle despite spending relatively little time performing traditional bodybuilding splits?
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It’s certainly plausible, although the ‘elite’ part often selects for athletes with the greatest muscle-building potential.
Much of their training isn’t simply conditioning. It’s high-density resistance training performed under accumulating fatigue, with only fleeting recovery between efforts. In other words, they’re often doing something bodybuilders have deliberately programmed for decades: packing a lot of hard work into a very short period of time.
That’s not to say 21-15-9 is superior to a well-designed hypertrophy programme. If your sole goal is building muscle, there are more efficient ways to do it.
But if you’re looking for a workout that develops fitness, tests your mettle and still provides a meaningful stimulus for strength and size, it’s easy to see why this deceptively simple rep scheme has remained one of CrossFit’s defining fingerprints for more than 20 years.
Best Bodyweight 21-15-9 Workout: ‘JT’
If you’re looking for an interesting twist on the 21-15-9 format, look no further than Hero WOD ‘JT’, which concentrates the muscle-building potential of the format into a brutal upper-body workout.
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Created in honour of Petty Officer 1st Class Jeff Taylor, who was killed in Afghanistan in 2006, the workout strips away barbells altogether and relies solely on three bodyweight movements:
21-15-9 reps of:
Don’t let the lack of equipment fool you. The volume – 45 reps of each movement, 135 reps in total – combined with the descending rep scheme makes this a brutal upper-body test, hammering the shoulders, chest and triceps while demanding serious muscular endurance.
Better still, it perfectly demonstrates one of the biggest strengths of 21-15-9. As fatigue mounts and the sets naturally fragment, the workout begins to resemble one giant rest-pause set, allowing you to accumulate a huge number of hard, near-failure reps in less than 10 minutes.
If your goal is building an impressive upper body while developing serious work capacity, there are few bodyweight workouts that deliver quite so much bang for your buck, making ‘JT’ one of my personal favourites.
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If there’s one thing Kori Sampson knows, it’s how to optimise your body composition for performance. To tap into his knowledge as an elite athlete and coach, we asked him to create a 4-week plan to help you move faster, recover quicker and keep pushing when the fatigue sets in – all while improving your muscle-to-fat ratio.
Ready to build muscle, burn fat and come out the other side looking, feeling and performing better? Click here to get 14 days of free access to the plan via the Men’s Health app.
