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30-day squat challenge: a chair track and a single-leg track

Three short squat sessions a week, with optional practice on other days, climbing a ladder from sit-to-stands on a chair to single-leg squats rather than piling up hundreds of easy reps. Start with the 30-second chair stand test, pick the track that fits, and test again on day 30. Four weeks is long enough for strength and control to improve, but not to change the shape of your thighs.

3 training days15 min a session4 weeksBeginnerA sturdy chair against a wall; a step or low bench for the harder track

Your week

Tap a day to open its session, with a follow-along player.

  1. MonChallenge day15 min · 12 movesDay 1: do the 30-second chair stand test first, then find your step
  2. TueRest, or optional squat snacks15 min · 12 movesOur editorial suggestion, not tested in a trial: 2 or 3 mini-sets of 5 to 10 slow reps at the step below your challenge step, spread through the day. Skip them if your legs are still sore
  3. WedChallenge day15 min · 12 moves
  4. ThuRest, or optional squat snacks15 min · 12 movesAs Tuesday
  5. FriChallenge day15 min · 12 moves
  6. SatRest, or a walk40 min · 3 movesA walk of 20 to 40 minutes at a pace where you can talk but not sing
  7. SunRest

The sessions

Every move links to its guide and 3D demo, with an easier and a harder option.

Squat challenge workout

15 min · Beginner

  1. Standing march1 to 2 minutes · 3D demo · Beginner
  2. Standing hip CARs3 slow circles each way, each hip · 3D demo · Beginner
  3. Knee-to-wall ankle rock8 slow rocks each side · 3D demo · Beginner
  4. Sit to stand, pushing on the thighs2 to 3 sets of 8 to 12 · 3D demo · Beginner
  5. Sit to stand from a chair2 to 3 sets of 8 to 12 · 3D demo · Beginner
  6. Bodyweight squat2 to 3 sets of 10 to 15 · 3D demo · Beginner
  7. Bodyweight squat3 sets of 10 to 15 · 3D demo · Beginner
  8. Split squat3 sets of 8 to 12 each leg · 3D demo · Intermediate
  9. Reverse lunge3 sets of 8 to 12 each leg · 3D demo · Intermediate
  10. Rear-foot-elevated split squat (Bulgarian split squat)3 sets of 6 to 10 each leg · 3D demo · Intermediate
  11. Skater squat3 sets of 5 to 8 each leg · 3D demo · Advanced
  12. Deep squat hold30 to 60 s · 3D demo · Intermediate
  13. Half-kneeling hip flexor stretch30 s each side · 3D demo · Beginner
Start this session

How the weeks progress

Week 1
Test, then learn your step

Day 1: do the 30-second chair stand test, then find your step, the hardest one you can do 8 times, lowering for 3 seconds, with 3 or 4 reps to spare. Chair track: 2 sets of 8 to 12 of a sit-to-stand pushing on your thighs, a sit-to-stand with no hands, or a squat to a chair. Single-leg track, if you can already do 3 sets of 15 bodyweight squats with your thighs about level and your heels down: 2 sets of 6 to 10 each leg, or 10 to 12 paused squats. Stop every set with 3 or 4 reps to spare.

Week 2
Add a set, then reps

Both tracks: 3 sets, stopping 2 or 3 reps short, and add 1 or 2 reps a session. Chair track: build to 12 sit-to-stands or 15 squats a set. Single-leg track: build to 12 split squats or reverse lunges each leg, or 10 Bulgarian split squats or 8 skater squats each leg.

Week 3
Harder, not just more

When all 3 sets reach the top of the range, do one session lowering for 5 seconds with a 2-second pause, then move up a step and go back to the bottom of its range. Chair track: from pushing on your thighs to no hands, then to touching the chair lightly instead of sitting, then a lower chair, then no chair. Single-leg track: paused squat, split squat, reverse lunge, Bulgarian split squat, then skater squat.

Week 4
Settle, then retest

Both tracks: 3 sets at your new step, adding reps toward the top of its range. Friday is the last hard session. Rest on day 29 if your legs are sore, then repeat the chair stand test on day 30 with the same chair, the same rules and at the same time of day, and write down your score and your step.

How to run it

Picking your track

On day 1, do the 30-second chair stand test as our test page describes: arms crossed, a firm chair against a wall, and someone beside you if you're unsteady. In 76 older adults it gave much the same score on two days and went with leg-press strength, so it will show change over the month.

Take the chair track unless you can already do 3 sets of 15 bodyweight squats with your thighs about level and your heels down; if you can, take the single-leg track. On either track, train at the hardest step you can do 8 times, lowering for 3 seconds, with 3 or 4 reps to spare. The cut-offs, rep ranges and weekly targets are our editorial starting points, built on our squat guide and the lunge and pistol squat progressions.

Source 1

Form before numbersEmerging evidence

Feet about shoulder-width apart, toes turned out a little and your weight through your whole foot. Lower for about 3 seconds, to a chair at first, until your thighs are about level with the floor, then stand up without bouncing, breathing out as you rise.

Your knees can travel past your toes, as long as they point the same way as your toes. Holding the knees back gave no advantage in a 6-week trial of bodyweight squats in 60 active young adults, the NHS's own mini-squat says to aim your knees over your big toe, and a review of knee loads concluded that deep squats, learned with good technique, don't add injury risk.

You don't need to go to failure. The American College of Sports Medicine found it doesn't add strength, and that stopping 2 or 3 reps short is enough effort. If a rep looks different from the first one, the set is over.

Sources 2, 3, 4, 5

Rest days, and the optional practice daysEmerging evidence

The three challenge days carry the training, with a day between them. With the same weekly work, training 3 or 6 days a week gave similar results in a trial of 27 trained men, and a review of 22 studies found that how often you train mattered for strength only through the extra work it adds. In 10 trained men, sets taken to failure needed up to 24 to 48 hours longer to recover from.

The squat snacks on Tuesday and Thursday are our editorial suggestion, and they're optional: no trial has compared them with 3 days alone. Short bouts can work: in 45 trained young men, three short bouts of machine squats a day built strength about as well as one session, and in 97 adults aged 65 and over a 4-minute daily routine was done on 81% of days. Keep Sunday as a full rest day.

Sources 6, 7, 8, 9, 10

If a day is too hard

Drop back a step, or do 2 sets instead of 3: your step is the plan, not the date. Missed a day? Carry on with the next session rather than doubling up. Soreness for a day or two after the first sessions is common and fades as you repeat them.

Knee pain up to 2 out of 10 is fine, and up to 5 is acceptable if it has settled by the next morning, as our knee pain guide says: in trials of long-term muscle and joint pain, exercise that allowed some pain did as well as pain-free exercise. Stop and get advice for sharp pain, a knee that catches or gives way, or new swelling. Contact NHS 111 (in the US, your doctor or urgent care) if your knee is very painful, you can't put weight on it, or it's red and hot with a high temperature.

If missing a day makes you anxious, or you find yourself exercising to make up for food, talk to your GP. In interviews after a month-long daily activity challenge, some people described feeling like a failure when they missed their targets, and some said it encouraged obsessive exercising.

Sources 11, 12, 13

What the evidence says

What 30 days can and can't changeEmerging evidence

The likely gains are stronger, steadier legs and, often, a step up the ladder. In one small study of 22 inactive adults, with a 2-week control period but no separate control group, 5 minutes a day of slow bodyweight moves that got harder over 4 weeks raised a leg-strength test, a standing pull against a fixed bar, by about 13%, and 16 of the 22 finished beyond chair squats. In 14 frail adults aged 75 to 88, with no control group, sit-to-stand training raised knee strength by about 18% in the first 4 weeks.

Most of this evidence comes from small studies without a control group, and much of the early gain is your body learning the movement and getting used to the test. Muscle size starts to change only around weeks 3 to 4 of hard training, so judge the month by your test and your step, not the mirror.

Sources 14, 15, 16, 17, 18

A harder step rather than 100 a dayMixed evidence

One small study of 25 people in their late 70s found that 100 bodyweight squats a day for 4 months didn't build strength or thigh muscle; we have read only its abstract. In another study of 94 teenage boys, those doing 100 squats a day for 8 weeks did gain knee strength, by about 16%, compared with boys who didn't train. So the count on its own gives mixed results.

This plan raises the difficulty rather than the count. That is our editorial reading of the progression evidence: in a small 6-week trial of 13 inactive young women, a ladder from two-leg to one-leg squats built leg strength and glute muscle about as much as barbell squats, and the American College of Sports Medicine found that light and heavy loads build similar muscle when the effort is high enough, close to failure or 2 to 3 reps short.

Sources 19, 20, 21, 5

It won't slim your thighsStrong evidence

Across 13 studies of 1,158 people, training one leg or arm didn't reduce the fat over it any more than on the untrained side. Strength training does trim body fat a little overall, by about 1.5 percentage points against no training across 58 studies. Fat loss mostly comes from eating less and moving more through the day; our weight loss plan covers that.

Sources 22, 23

Older adults: the chair trackEmerging evidence

Standing up from a chair is the strength you use all day. In a randomised trial of 97 adults aged 65 and over with walking difficulty, a 4-minute daily routine for 12 weeks added about 4 stands in the 30-second chair test compared with a group who waited, with no serious adverse events. In 16 older adults doing squats to a chair at home 3 days a week, chair test scores had improved by week 8 rather than week 4.

Keep a counter within reach and the chair behind you. If you've fallen in the past year, talk to your GP first, and see our workout plan for seniors.

Sources 10, 24

A leg challenge, not a whole workoutStrong evidence

Guidelines ask adults to do strength work for all the major muscle groups on at least 2 days a week. This challenge trains the legs and hips only. Pair it with the push-up and plank challenges and a pulling move such as band rows, or move on to a full-body plan.

Sources 25, 26

Check first if this applies to youStrong evidence

Before the day 1 test, answer the PAR-Q+ (the Physical Activity Readiness Questionnaire for Everyone). A yes to any of its questions, such as a heart condition, chest pain, dizziness or a bone or joint problem, leads to follow-up questions that may send you to your doctor or a qualified exercise professional first. The World Health Organization notes that people without such problems generally don't need a medical check before light or moderate activity.

With ME/CFS (myalgic encephalomyelitis or chronic fatigue syndrome), NICE (the National Institute for Health and Care Excellence) advises against general exercise programmes and fixed increases, which is what a challenge is. In pregnancy, start anything new gently and don't take up new vigorous exercise; sit-to-stands and squats to a chair are our suggestion.

Sources 27, 25, 28, 29

Warning signsStrong evidence

Dark, red or cola-coloured urine, much less urine than usual, or very painful, weak, swollen muscles in the days after a session can be rhabdomyolysis, a breakdown of muscle that can harm the kidneys: get medical help the same day. It is rare. It can follow severe exertion, including bodyweight exercise; a review links it to exercise that is badly prescribed or used as punishment, and in a cluster of three cases the only common factor was unaccustomed hard exercise. That is one reason this plan starts low.

Call 999 (911 in the US) for sudden, severe pain in any part of your body, which can be compartment syndrome, or for chest pain that doesn't go away, spreads to your arms, neck, jaw, stomach or back, or comes with sweating, feeling sick, light-headedness or breathlessness.

Sources 30, 31, 32, 33, 34

After the 30 daysEmerging evidence

A challenge is a start. In an evaluation of a 24-day push-up challenge in Australia, physical activity was a little higher 2 weeks after it ended but no higher 3 months later, and in 91 people doing an 8-week gym challenge, class attendance fell back once it finished. Habits take longer than 30 days to form: in the four studies of a review that timed it, the typical time was 59 to 66 days, ranging from 4 to 335.

Choose your next step before day 30. In nearly 390,000 fitness app users, training consistently in the first 28 days was the strongest predictor of still training a year later. Keep training your legs at least twice a week with our squat technique workout, the lunge or pistol squat progressions, or a full plan such as the 3-day home workout plan.

Sources 35, 36, 37, 38

Who it suits

  • Beginners who want a short leg habit: start on the chair track
  • Older adults who want to get out of chairs more easily, with a counter within reach
  • Already doing 15 good squats? The single-leg track makes it harder with no equipment
  • Not a fat-loss plan: squats don't slim your thighs

Other plans

3 days a week

30-day push-up challenge: from wall push-ups to archer push-ups

A free 30-day push-up challenge, from wall to archer push-ups: 3 short sessions a week, optional practice days and a push-up test at each end.

Beginner15 minA wall and a sturdy worktop, bench or step; a resistance band helps3 days a week

30-day plank challenge: harder planks, not longer ones

A free 30-day plank challenge that gets harder, not longer: three plank sessions a week, two optional McGill big 3 days and a plank test at each end.

Beginner12 minA mat and a cushion for your knees2 days a week

Beginner workout plan: your first 4 weeks

Your first four weeks: two, then three short strength sessions a week at home plus walks, building gently to a full routine.

Beginner20 minNone (a chair and a wall; a band helps)4 days a week

Glute workout plan

An 8-week glute workout plan: two glute days and two upper-body days a week, with hip thrusts, squats, hinges and side-hip work, plus a home option.

Intermediate50 minGym (home swaps listed): barbell, bench, dumbbells, hip abduction machine, bands

Swap in other moves

Questions people ask

Does the 30-day squat challenge work?

For what squats train, it can. In one small study, inactive adults doing 5 minutes of slow bodyweight moves a day that got harder over 4 weeks improved a leg-strength test by about 13%. Ever-higher numbers of easy squats give mixed results: one small study found 100 a day for 4 months didn't build strength in people in their late 70s, while teenage boys in another study did improve. This plan raises the difficulty instead, which is our reading of that evidence.

How many squats a day should I do?

There's no magic number. On challenge days, do 2 or 3 sets at your step, stopping 2 or 3 reps short, and on the optional practice days a few mini-sets of 5 to 10 at the step below. When every set reaches the top of its range, move to a harder step rather than adding more reps.

Is it OK to do squats every day?

Easy squats, yes, if your legs feel fine; hard sets don't need to be daily. With the same weekly work, training 3 or 6 days a week gave similar results in a trial, and sets taken to failure take longer to recover from. This plan has 3 challenge days, optional practice on 2 others and a full rest day.

Will 100 squats a day make my bum bigger?

Probably not by much. Teenage boys gained about 3% in thigh muscle from 100 a day for 8 weeks, but people in their late 70s gained nothing measurable in 4 months. Harder steps keep the work challenging, and our glute workout plan is the route if glute size is your goal.

Will squats burn thigh or belly fat?

Not from that spot: across 13 studies, training one leg or arm didn't reduce the fat over it any more than on the other side. Strength training trims body fat a little overall, and eating less and moving more through the day do most of the work.

What results can I expect in 30 days?

Strength and reps tend to rise within 4 weeks, and the chair stand test is a good way to see it, but muscle size often isn't measurably bigger yet. Much of the early gain is your body learning the movement and getting used to the test, so compare yourself with yourself. In one small study, about 3 in 4 inactive adults moved beyond the first chair step in 4 weeks.

Are squats bad for your knees?

Not for healthy knees: a review concluded that deep squats, learned with good technique, don't add injury risk, and letting your knees travel over your toes is normal. With knee pain, use the chair track and a higher chair, and keep pain to 5 out of 10 or less, settling by the next morning.

Is the squat challenge safe for seniors?

For most people, on the chair track, with the chair against a wall and a counter within reach. In a trial of adults aged 65 and over with walking difficulty, a 4-minute daily routine improved chair stands with no serious adverse events. If you've fallen in the past year, see your GP first.

What if I miss a day?

Carry on with the next session and don't double up. What counts is the weeks, not a single day: in a very large study of fitness app users, training consistently in the first 28 days went with still training a year later.

What should I do after the 30 days?

Choose your next step before day 30, because the extra activity from a challenge tends to fade within months. Keep training your legs at least twice a week, as guidelines advise for strength work, with our squat technique workout, the lunge progression or the 3-day home workout plan.

Sources

  1. Jones 1999 · The 30-second chair stand test as a measure of leg strength in 76 older adults (reliability and validity study, Research Quarterly for Exercise and Sport)
  2. Movahhedi 2026 · Letting the knees travel forward or holding them back in 6 weeks of bodyweight squats, 60 active young adults (randomised trial, Journal of Clinical Medicine)
  3. NHS · Strength exercises
  4. Hartmann 2013 · Loads on the knee and spine at different squat depths (literature review, Sports Medicine)
  5. Currier 2026 · ACSM position stand: resistance training prescription for muscle function, hypertrophy and physical performance (overview of 137 reviews, MSSE)
  6. Saric 2019 · Training 3 or 6 times a week with the same weekly work, in 27 trained men (randomised trial, JSCR)
  7. Grgic 2018 · Resistance training frequency and gains in muscular strength (meta-analysis, Sports Medicine)
  8. Morán-Navarro 2017 · Recovery after sets taken to failure or stopped short, in 10 trained men (crossover study, European Journal of Applied Physiology)
  9. Zhai 2026 · Three short bouts of squats a day or one session, for 8 weeks in 45 trained young men (randomised trial, Journal of Exercise Science and Fitness)
  10. Dandekar 2026 · A 4-minute daily strength routine for 12 weeks in 97 adults aged 65 and over with walking difficulty (randomised trial, PLOS ONE)
  11. Smith 2017 · Should exercise be painful in long-term muscle and joint pain? 7 trials, 385 people (systematic review and meta-analysis, BJSM)
  12. NHS · Knee pain
  13. Wheatley 2021 · RED January, a month of daily activity for mental health, from interviews with 40 people (qualitative study, Mental Health and Physical Activity)
  14. Kirk 2025 · A daily 5-minute bodyweight programme for 4 weeks in 22 inactive adults (single-group study with a 2-week control period, European Journal of Applied Physiology)
  15. Fujita 2019 · Sit-to-stand training for 12 weeks in 14 frail adults aged 75 to 88 (training study with no control group, Experimental Gerontology)
  16. Folland 2007 · How strength training raises strength: changes in the nerves and the muscle (review, Sports Medicine)
  17. Seynnes 2007 · Early muscle growth in the first 5 weeks of hard training in 7 adults (training study, Journal of Applied Physiology)
  18. DeFreitas 2011 · The week-by-week time course of muscle growth over 8 weeks of training in 25 men (training study, European Journal of Applied Physiology)
  19. Hirono 2023 · 100 bodyweight squats a day for 4 months in 25 adults aged about 78 (controlled trial, Aging Clinical and Experimental Research)
  20. Takai 2013 · 100 bodyweight squats a day for 8 weeks in 94 adolescent boys (randomised trial, Journal of Sports Science and Medicine)
  21. Wei 2023 · A 10-step bodyweight squat ladder or barbell squats for 6 weeks in 13 inactive young women (randomised trial, Scientific Reports)
  22. Ramirez-Campillo 2022 · Does training a body part burn the fat over it? 13 studies, 1,158 people (systematic review and meta-analysis, Human Movement)
  23. Wewege 2022 · Strength training and body fat in healthy adults, 58 studies (systematic review and meta-analysis, Sports Medicine)
  24. Yoshiko 2021 · Home squats to two depths for 12 weeks in 16 older adults (randomised trial, Scientific Reports)
  25. Bull 2020 · World Health Organization 2020 guidelines on physical activity and sedentary behaviour (BJSM)
  26. NHS · Physical activity guidelines for adults aged 19 to 64
  27. PAR-Q+ Collaboration 2025 · The Physical Activity Readiness Questionnaire for Everyone (PAR-Q+)
  28. NICE NG206 · Myalgic encephalomyelitis (or encephalopathy)/chronic fatigue syndrome: diagnosis and management
  29. NHS · Exercise in pregnancy
  30. MedlinePlus · Rhabdomyolysis (US National Library of Medicine)
  31. Rawson 2017 · Perspectives on exertional rhabdomyolysis (review, Sports Medicine)
  32. Mitchell 2018 · Exertional rhabdomyolysis in three young women after the same gym workout (case reports, BMJ Case Reports)
  33. NHS · Compartment syndrome
  34. NHS · Chest pain
  35. Logan 2026 · Evaluating the Push-Up Challenge in Australia: mental health, help-seeking and exercise (pre-post survey study, Journal of Prevention)
  36. Furman 2026 · Exercise during and after an 8-week gym body-composition challenge in 91 people (observational study, Applied Psychology: Health and Well-Being)
  37. Singh 2024 · How long it takes to form a health habit, 20 studies (systematic review and meta-analysis, Healthcare)
  38. Conti 2026 · What predicts sticking with strength training, in 389,481 fitness app users (observational study, Frontiers in Sports and Active Living)

A general plan for adults without symptoms or restrictions, not a prescription. Start lighter than you think, stop for sharp or increasing pain, numbness, chest pain, faintness or unusual breathlessness, and get individual advice if you are pregnant, after an injury or surgery, or managing a health condition. Health disclaimer.