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Study finds doing this five-minute workout daily can ‘significantly improve fitness’

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Study finds doing this five-minute workout daily can ‘significantly improve fitness’

There’s a common misconception that you need to spend an hour in the gym, several times per week, to make a dent on your health and fitness goals. But for most people, this simply isn’t the case.

Instead, any regular activity is likely to have an impact. A recent study published in the European Journal of Applied Physiology supports this, finding that a five-minute strength training routine, performed daily for four weeks, led to “significantly improved physical fitness and mental health in sedentary individuals”.

As far as I can see, the routine was nothing groundbreaking either, comprising progressive variations of the bodyweight squat, press-up, sit-up and calf raise. The progressive nature and consistency with which these exercises were performed is where the magic truly lies.

Though the sample size is small, what the study shows is that small amounts of exercise, and strength training in particular, can offer untold perks for beginners. I investigated why this might be the case, and how you can use this information to efficiently further your own health and fitness.

The workout

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  • Chair squat x10
  • Wall press-up x10
  • Chair recline x10 (similar to a sit-up, but performed in a chair with less range of motion)
  • Heel drop x10 (a calf raise)

The “healthy but sedentary” participants of this study – four men and 18 women aged between 32 and 69 – performed 10 repetitions of each exercise to a strict tempo. This meant elongating the eccentric (or lowering) phase of each repetition for five seconds, then completing the concentric (or lifting) phase in roughly one second.

For the chair squat, for example, this would involve sitting down slowly over the course of five seconds, then standing up as normal.

“Participants were allowed to choose the time at which they completed the exercises, and the exercises could be performed together or spread throughout the day,” the research adds.

Once participants could complete 10 repetitions of an exercise with an RPE (rate of perceived exertion, or how hard an exercise feels) score of five out of 10 or less for two consecutive days, they were instructed to progress to a more challenging variation of the exercise. These variations were:

  • Chair squat > one-leg chair squat > pistol squat
  • Wall press-up > one-arm wall press-up > table press-up > knee press-up > press-up
  • Chair recline back > chair recline back (legs straight) > sit-up
  • Heel drop > heel drop overstretch > one-leg heel drop overstretch

Again, I want to stress that this isn’t a magic formula. It simply plays on tried and trusted strength training principles – progressive overload and a combination of exercises which recruit most major muscle groups – to deliver the stimulus needed for positive changes in people new to this type of exercise.

The main takeaway should be that just a few short minutes of adequately challenging resistance training per day, even without weights, can make a significant difference in sedentary populations.

Read more: How doing squats between emails could boost your health in midlife

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You don’t need to exercise for an hour or go to the gym to see results, particularly if you’re new to strength training

You don’t need to exercise for an hour or go to the gym to see results, particularly if you’re new to strength training (Getty/iStock)

What this means for your fitness

This article isn’t aimed at people who run marathons for fun or sign up to every Hyrox race going. Instead, it speaks to anyone who wants to improve their health and fitness, but struggles to find the time, energy and motivation to squeeze exercise into their busy lives.

For this group, it’s important to understand that small amounts of activity, performed consistently and progressively as in the study above, can have a significant impact.

“Most evidence shows that even doing very small amounts of exercise or physical activity is beneficial for health, but more is better for us,” says Dr Richard Blagrove, a senior lecturer in physiology at Loughborough University.

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As a case study, he cites research published in the British Journal of Sports Medicine, which found that those burning a bonus 500 calories across the week, averaging out at just 70 calories per day, “show reductions in risk of mortality compared to being completely inactive”.

“The same is true for resistance training,” he adds, with research finding that just one challenging set of an exercise can increase strength, thus benefitting “functional performance” – i.e. how well our bodies can serve us in daily life.

Read more: Will the run club replace the pub? Why choose when both can help fight a deeper issue?

Joe Wicks, pictured at EE Learn Live 2025, says he recognised a significant difference in energy levels between those who did exercise and those who didn’t during his recent your of UK workplaces

Joe Wicks, pictured at EE Learn Live 2025, says he recognised a significant difference in energy levels between those who did exercise and those who didn’t during his recent your of UK workplaces (Joshua Bratt)

This favourable dose-response relationship is something Joe Wicks stresses in his approach too. Wicks has been visiting workplaces across the UK as part of a new initiative on movement and wellness, and says he’s witnessed a night and day difference between people who did and didn’t find time to exercise.

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“I visited all of these companies, and you’d see people that are really struggling, people who are really busy, and people with kids who are working 12-hour shifts through the night,” says Wicks.

“What I realised is there are usually two groups; one of them is not exercising, and one of them is finding a little bit of time to do some form of exercise, whether it’s 10 minutes walking to work, something on their lunch break or a 20-minute YouTube workout when they get home.”

This latter group, he says, were healthier and more energised, with lower stress levels and better mental health. For this reason, he likes to highlight the importance of finding some time, however short, to move during the day.

“I want to make it really manageable and say, ‘Look, you might not have a full hour today, but do you have five, 10 or 15 minutes?’ It makes a difference,” he explains.

Walking and home workouts like his session below are Wicks’ premier prescriptions for beginners, with these accessible activities removing many of the usual barriers to entry for exercise such as time and money.

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Read more: Forget the gym – build full-body strength anywhere with this trainer-approved kettlebell workout instead

Another top option is exercise snacking – the act of microdosing fitness throughout the day. It’s a wellness trend that’s both easy to access and adhere to, no matter your fitness level.

A four-week study by the University of Essex and University of Suffolk found that just 16 total minutes of bodyweight exercises such as squats and lunges, spread across an eight-hour work day, “can mitigate against the negative effects of prolonged sedentary time [or sitting at a desk all day]”. Subjects saw improved leg strength and balance from the minimalist exercise plan.

Meanwhile, research in the Exercise and Sport Sciences Reviews journal honed in specifically on the term “exercise snacks”.

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It defined the phrase as “isolated bouts of brief (

Read more: This is how much exercise you should be doing per day, according to experts

Any activity we do consistently is likely to have an impact on our body, such as exercising or sitting at a desk. The impacts can be both positive and negative.

Any activity we do consistently is likely to have an impact on our body, such as exercising or sitting at a desk. The impacts can be both positive and negative. (Getty/iStock)

The foundational theory behind this is called the SAID principle, which stands for specific adaptations to imposed demands. This simply means the body will adapt over time to get better at handling the things we consistently ask it to do.

If we sit in a chair all day, it might tighten our hip flexors to save us some energy. However, this is likely to feel unpleasant when we go to lengthen them again while walking or exercising.

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Conversely, if we’re regularly raising our heart rate, cardiorespiratory fitness improvements are likely to follow, while consistent and challenging resistance exercise will lead to improvements in strength and muscle, provided we’re fuelling and recovering appropriately.

For this reason, any long-term change in behaviour which sees you challenging yourself physically and doing more than you were before will probably result in positive adaptations to your body.

This is partly why those who have been exercising for a long time require more dramatic changes to see progress, while newcomers can make incredible headway from just a few small tweaks like those discussed above.

Read more: Helen Mirren opens up on ‘complications’ of ageing as she shares advice for younger people

Doing small bouts of exercise throughout the day can add up to have a large impact on your health and fitness

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Doing small bouts of exercise throughout the day can add up to have a large impact on your health and fitness (Alamy/PA)

Key takeaways – and a free workout plan to try

The bottom line here is that, as far as exercise is concerned, a little goes a long way. This is especially true if you’re a beginner.

The title study shows how a few quick exercises can improve strength and mental health in sedentary adults, while the further research referenced above suggests these benefits also extend to cardiorespiratory fitness – the ability of the heart, lungs and blood vessels to supply oxygen to your working muscles during exercise.

If you want to put this information to good use by weaving some time-savvy exercise into your hectic schedule, my best advice would be to first pick one exercise you can do for each of strength coach Dan John’s basic human movements (push, pull, hinge, squat, carry). Then, perform each exercise for 8-12 repetitions, between one and three times throughout day. For example:

  • Push: Wall press-up x8-12
  • Pull: Bent-over row with a rucksack x8-12
  • Hinge: Good morning x8-12
  • Squat: Chair sit-to-stand x8-12
  • Carry: Suitcase carry with a rucksack x8-12m in each hand

You might do this immediately after waking up, on your lunch break or whenever you boil a kettle while working from home – I realise this may draw a few funny looks in the office kitchenette.

When an exercise feels easy, find a harder variation or, in the case of the row and carry, incrementally increase the weight you’re lifting so it continues to provide a challenge. Et voila: an equipment-free beginner exercise plan for even the most time-poor of people.

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Read more: The three short weekly workouts that can transform your fitness

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Fitness

“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

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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.

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Why 21-15-9 Might be the Smartest Workout Format in Fitness – and How to Use it to Drive Muscle Growth

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Why 21-15-9 Might be the Smartest Workout Format in Fitness – and How to Use it to Drive Muscle Growth

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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fitness magazine cover featuring a muscular man with kettlebells

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.


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10 minutes of swimming might not sound worth it – but I tried it for 2 weeks and found the benefits of a quick dip

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10 minutes of swimming might not sound worth it – but I tried it for 2 weeks and found the benefits of a quick dip

The concept of ‘exercise snacking’ has never been more popular. Not only is it convenient and accessible, but there is solid scientific evidence that short bursts of physical activity can yield real benefits for our health. But can a swimming workout be an effective ‘exercise snack’?

A study published in the European Heart Journal found that just 15 to 20 minutes of vigorous physical activity a week (almost as low as two minutes a day) was enough to significantly lower the risk of heart disease, cancer and early death. The study defined vigorous activity as any exercise that leaves you out of breath and raises your heart rate, including swimming.

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