Pilates for bodybuilders: does it build muscle, bracing and breathing, shoulders, lower back and hips, recovery, the evidence and a routine

No study in people who lift

Our searches found no Pilates study in bodybuilders, powerlifters or anyone else who already lifts, for muscle, strength or injuries. The nearest is a small trial in gym members who did unsupervised mat Pilates.

Sources 1, 2

It won't build muscle like your lifting does

In pooled trials, Pilates didn't clearly change lean mass. On scans, 36 weeks of Pilates grew inactive women's six-pack muscle but not their hip and lower-back muscles, with no comparison group. Muscle grows with hard sets close to failure, and enough of them each week.

Sources 3, 4, 5, 6, 7, 8

More stretch won't add size, so time it

An expert panel doesn't recommend stretching as a way to build muscle, and long static holds just before heavy sets cost a few per cent of force. Do Pilates after lifting or on a rest day.

Sources 9, 10, 11

Pilates breathing isn't a lifting brace

Bracing raised the pressure inside the abdomen far more than drawing the belly in, and a held breath in heavy leg presses took 5 bodybuilders' blood pressure very high. Pilates teaches control while you breathe; a brief brace belongs to heavy sets.

Sources 12, 13

Shoulders, backs and knees

Training injuries are uncommon in competitive bodybuilding, mostly the shoulder, elbow, lower back and knee, though many people train with pain. Pilates can train the shoulder blades, rotator cuff and trunk at low load, but no trial shows it prevents lifting injuries.

Sources 14, 15

A lighter day, not a recovery treatment

Light activity eased soreness in a few small studies and stretching didn't. A gentle class can be your rest-day movement; count a hard reformer class as training.

Sources 16, 17

The sport, in one paragraph

Bodybuilding and physique sport are judged on stage, in poses and quarter turns, not on lifts. The training is ordinary muscle-building training, usually split across body parts, and the serious health risks come from long contest diets, peak-week practices and drugs, which our bodybuilding guide sets out. This guide is about training, not the stage.

How hard Pilates isStrong evidence

The Compendium of Physical Activities gives traditional mat Pilates 1.8 METs (multiples of resting energy use) and Pilates in general 2.8, against 6.0 for vigorous weight training, "power lifting or body building". So Pilates is a lighter session, not conditioning.

Source 18

Where bodybuilders and gym lifters get hurtEmerging evidence

In 71 German competitive bodybuilders there were 0.24 injuries per 1,000 hours of training, mostly the shoulder, elbow, lower back and knee, with more over 40; 45.1% had symptoms while training. Across 20 studies of the weight-training sports, bodybuilding had the lowest rates, though only 5 studies were at low risk of bias. In 381 Iranian recreational weight trainers followed for 9 months, there were 1.86 injuries per 1,000 training hours (any musculoskeletal complaint counted), led by the lower back (24.2%), shoulders and neck (20.38%) and knees (16.6%); a previous injury raised the odds 3.74 times, and training with a partner went with about 70% lower risk. In 1,123 gym members in Bangladesh, the lower back (36.6%), shoulder (24.7%) and knee (17.1%) led. Up to 36% of resistance training injuries were at the shoulder in one review, and 7% of 113 Brazilian bodybuilders had hip pain in the past week.

Sources 14, 19, 15, 20, 21, 22

What Pilates offers, and what it doesn't

Pilates can train trunk endurance and control while you breathe, the shoulder blades, rotator cuff and upper back at low load, the hips through their range, and a slow wind-down on a rest day (our reading). It can't replace progressive lifting, your coach, the brace for heavy sets or rehabilitation of an injury. In people who weren't training, Pilates built strength no better or worse than other exercise across 11 trials, at very low to low certainty.

Source 23

No study in people who lift

Our searches of PubMed, Europe PMC and ClinicalTrials.gov on 1 November 2026 found no Pilates trial or study in bodybuilders, powerlifters or other resistance-trained people. The nearest are 34 gym members who did unsupervised mat Pilates (a pilot trial with ultrasound only), 19 women already trained in Pilates in a protein trial, and short Pilates-style stretches before a strength test in 102 trained young adults.

Sources 1, 2, 24, 25

Lean mass doesn't change in pooled trialsEmerging evidence

Across 12 studies of about 540 adult women, lean mass changed by 0.46 kg on average, anywhere from 2.35 kg less to 3.27 kg more, and only 2 studies (60 women) measured it; the authors found no pooled effect on lean mass, grip strength or vertical jump. In 11 trials of 393 adults with overweight or obesity, lean mass didn't change (0.00 kg). One more review found mat Pilates no better than control or other training for body composition, and another called its effect "still uncertain".

Sources 3, 4, 26, 27

On scans, the six-pack muscle grew; the hip and back muscles didn'tMixed evidence

In one Spanish lab, 12 inactive women started 36 weeks of supervised Pilates twice a week and 9 finished. On magnetic resonance imaging (MRI) scans, the six-pack muscle (rectus abdominis) grew 21%, and the side and deep tummy muscles 8% on one side, but the quadratus lumborum, iliopsoas, piriformis and glutes didn't change significantly. The authors say: "The benefits of Pilates in rehabilitation or training are likely elicited by neuromuscular rather than morphological adaptations". There was no comparison group. In 34 gym members, 8 weeks of unsupervised mat Pilates thickened the deepest tummy muscle "only when performing Pilates exercises", and the strength training group's internal oblique thickened more.

Sources 5, 6, 2

Against resistance trainingEmerging evidence

In 60 women aged 60 to 80 (49 finished), "the Muscular training program generated greater benefits on trunk and hip isokinetic strength" than Pilates over 18 weeks, though the two groups didn't differ significantly from each other. In 34 women aged about 70, core resistance training with feedback beat Pilates for trunk strength, leg power, balance and body composition. A 2024 review of 24 trials in older adults concluded that "it is not feasible to recommend Pilates exercises as a means to improve strength, endurance and muscle power in the older adults".

Sources 28, 29, 30, 23

Body composition scales can misleadEmerging evidence

In 19 women already trained in Pilates, a bioimpedance scale showed lean mass rising while a DXA scan showed it rising only in the arms, "with BIA overestimating lean mass compared with DXA"; adding protein made no difference. Small gains reported on bioimpedance scales are unreliable.

Source 24

Core training in athletesEmerging evidence

Across 31 trials in 693 athletes, trunk training improved trunk muscle endurance most, with smaller gains in strength, power and sport performance. In 29 trials, core training improved core endurance and balance, but sport performance not significantly, and in 22 studies it improved jumping but not throwing or hitting speed; an older review called the performance benefits marginal. In athletes from four sports, including weightlifting, 9 weeks of progressive core stabilisation training improved sprint power and jumps more than standard core exercises, with no lifting or injury outcome.

Sources 31, 32, 33, 34, 35

Pilates and back pain in generalEmerging evidence

A Cochrane review of 10 trials (510 people) found "low to moderate quality evidence that Pilates is more effective than minimal intervention for pain and disability", but no better than other exercise for disability. Across 118 trials, Pilates ranked among the most effective exercise for chronic low back pain, with strength, core-based and mind-body exercise. That is back pain in general, not in lifters.

Sources 36, 37

How muscle growsStrong evidence

With every set taken to failure, muscle grew about as much with light loads as with heavy ones, while heavy loads built more maximal strength (21 studies). A network meta-analysis of 28 studies agreed: "Although muscle hypertrophy improvements seem to be load independent, increases in muscle strength are superior in high-load RT programs" (RT is resistance training). More weekly sets bring more growth, with diminishing returns (67 studies, 2,058 people), and the American College of Sports Medicine's 2026 position stand says "Muscle hypertrophy was enhanced by higher volumes (≥10 sets/wk) and eccentric overload". Going all the way to failure added very little.

Sources 7, 38, 39, 8, 40

Why Pilates isn't a muscle-building programme

Pilates sets are rarely taken close to failure, rarely made progressively harder and not counted as weekly hard sets, so Pilates isn't a hypertrophy programme (our reading). No study has measured how close to failure Pilates sets are. Springs, bands and weights can make Pilates harder, as our guide to Pilates and strength explains.

Add it, don't swap it

If you swapped lifting sessions for Pilates, you'd lose the stimulus that built your muscle (our reading). Keep your lifting as it is and add Pilates once or twice a week, 20 to 30 minutes, after lifting or on a rest day, as our weightlifters guide suggests.

Just before liftingStrong evidence

Static stretching just before activity cut performance by 3.7% on average, 4.6% with 60 seconds or more per muscle and 1.1% with less, with no clear loss when dynamic activity came afterwards. In 83 studies, maximal strength fell a little, and much more with holds of 60 seconds or more. An expert panel "does not recommend prolonged (>60 s per muscle) static stretching prior to maximal or explosive contractions". Short Pilates-style stretches (3 holds of 30 seconds) didn't change knee strength in 102 trained young adults.

Sources 11, 41, 42, 9, 25

Over weeks: a little growth, only at high dosesEmerging evidence

Across 25 studies, static stretching's effect on muscle size was small and uncertain, larger only in trained people and with long durations. In 42 studies, stretching raised strength and muscle size a little, and only with long, frequent stretching; in 19 studies, months of stretching lengthened muscle fibres a little without thickening the muscle. The expert panel: "The panel does not recommend stretching as a primary strategy to enhance muscle mass".

Sources 10, 43, 44, 45, 9

Stretching between setsMixed evidence

In 29 untrained adults, a 30-second stretch between sets for 8 weeks went with bigger thigh gains at one site. In 26 resistance-trained men, a loaded stretch between bench press sets made no difference either way, and in 22 trained adults, stretching between sets cut the total weight lifted.

Sources 46, 47, 48

Lifting improves range tooEmerging evidence

Across 11 trials (452 people), strength training and stretching improved range of motion about equally: "ST and stretching were not different in their effects on ROM" (ST is strength training, ROM range of motion).

Source 49

What to do

Do Pilates or longer stretches after lifting or on a rest day. Before lifting, a dynamic warm-up and ramp-up sets do the job, as our bodybuilding guide's warm-up does.

Two ways to use your trunkEmerging evidence

Bracing raised the pressure inside the abdomen by 116.4 mmHg, against 9.9 for drawing the belly in (hollowing). In a lab model of 8 young men, bracing raised spine stability by 32%, while the deepest tummy muscle added 0.14%. In 11 men, hollowing didn't reduce trunk movement after sudden loads and bracing did, and in 28 people both stiffened the spine, bracing more. A review of 22 trials found both improve trunk stability measures, with few direct comparisons.

Sources 12, 50, 51, 52, 53

Holding your breathEmerging evidence

In 5 experienced bodybuilders, heavy double-leg presses took blood pressure to an average peak of 320/250 mmHg. Pressure in the abdomen ran over 200 mmHg in heavy squats and about 79 in the bench press. A review says "A brief Valsalva maneuver (VM) is unavoidable when lifting heavy loads (>80% of maximal voluntary contraction) or when lifting lighter loads to failure", and that "The health risks associated with the VM during resistance exercise remain unconfirmed." (VM is the Valsalva manoeuvre, a breath held against a closed throat.)

Sources 13, 54, 55

BeltsMixed evidence

A belt raised abdominal pressure in heavy deadlifts in 9 people. In 28 men squatting, bracing raised abdominal muscle activity with or without a belt, and the belt alone didn't change muscle activity.

Sources 56, 57

"Switch on your core" cuesEmerging evidence

The idea of drawing in the deepest tummy muscle came from its delayed timing in 15 people with back pain. Later work found its early activity depends on the direction of movement and differs between sides, and that the diaphragm and tummy muscles raise abdominal pressure together while you keep breathing. For back pain, a review of 29 studies found "strong evidence stabilisation exercises are not more effective than any other form of active exercise in the long term", and a Cochrane review agreed.

Sources 58, 59, 60, 61, 62

Which to use when

Pilates breathing (out on the effort, ribs moving, at low load) suits control work and rest days. STOTT PILATES, one contemporary school, teaches a "3-D breath, especially into the posterior and lateral aspects of the rib cage". A brief brace belongs to heavy sets. Our Pilates for weightlifters guide and our guide to breathing when lifting set out bracing, belts and who shouldn't hold their breath.

Source 63

Where lifters' shoulders get hurtEmerging evidence

The shoulder is among the commonest injury sites in competitive bodybuilders and in gym lifters, and up to 36% of resistance training injuries were at the shoulder in one review. No trial has tested a shoulder programme to prevent lifting injuries.

Sources 14, 15, 20, 21

Where Pilates fits

Bodybuilders press and raise their arms for many sets a week. Pilates and band work can train the shoulder blades, outward rotation and the upper back at low load: band pull-aparts and rows, outward rotation, scapular push-ups, the knee hover, Y-T-W raises and the open book (our reading). A sore shoulder needs our shoulder pain guides, and our pain guides for the bench press and overhead press cover pain in those lifts.

Backs and hips in liftersEmerging evidence

The lower back led injuries in Iranian weight trainers and gym members in Bangladesh, and 7% of Brazilian bodybuilders had hip pain in the past week. Bodybuilding trainees with back pain had weaker trunk flexion and extension than those without, in a snapshot that can't show which came first.

Sources 15, 20, 22, 64

Where Pilates fits

Trunk endurance while you breathe, hip control through the range you'll use on leg days, and gentle spine movement. For back pain in general, Pilates helps about as much as other exercise. Back pain from deadlifts or squats has its own pain guides.

Sources 36, 31

Pilates isn't a recovery treatmentMixed evidence

Across 99 studies, active recovery reduced muscle soreness, though only 8 small groups (90 people) tested it, and it didn't reduce tiredness; stretching didn't reduce soreness. Low-intensity exercise had moderate to low evidence of easing muscle damage. In 10 active women, 4 weeks of gentle mat Pilates didn't significantly change blood lactate in a running test, with no comparison group. No study has tested Pilates for recovery from lifting.

Sources 16, 65, 66

Count it as trainingStrong evidence

The International Olympic Committee's consensus says "Emerging evidence indicates that poor load management is a major risk factor for injury", so a hard reformer class counts as a session, not a rest day.

Source 17

A week with Pilates

Once or twice a week, 20 to 30 minutes, after an upper-body session or on a rest day, not in the hour before heavy sets (our suggestion, matching our weightlifters guide). Keep it gentle the day after a hard leg session.

Posing and the show

On stage, competitors hold hard muscle contractions through poses and quarter turns, which is sustained work (our reading). This guide gives no posing, peak-week or contest advice: our bodybuilding guide covers contest preparation and its risks.

No advice on drugs, diuretics, water or salt

This guide doesn't advise on dieting, drugs, diuretics, water or salt for a show, and a Pilates class is never a way to sweat off water. Two case reports describe bodybuilders paralysed by dangerously low potassium, one after a large binge in the days after a competition, and the authors of the other say diuretics must always be considered as a cause. The warning signs below say when to call 999.

Sources 67, 68

Muscle dysmorphiaEmerging evidence

Across 31 studies, muscle dysmorphia scores (worry that you aren't muscular enough) were higher in bodybuilders than in other resistance trainers, and higher still in competitors, and went with anxiety, depression and perfectionism. The studies were of poor to moderate quality and can't show cause, and muscle dysmorphia is under-recognised in men. Help is in the warning signs below.

Sources 69, 70

Bodies

Pilates won't change your shape in any particular way, and we don't compare bodies or promise a look.

The hour before heavy sets

No long holds and no hard trunk session: static holds of 60 seconds or more per muscle just before maximal efforts cost a few per cent of force. A few minutes of breathing and mobility can go in your warm-up.

Sources 11, 9

Holding your breath

Pilates moves are done breathing. Save the braced breath for heavy sets, and leave it out with high blood pressure, heart disease, glaucoma, a hernia, recent surgery or in pregnancy, as our weightlifters guide and breathing guide say.

Sources 13, 55

A sore pressing shoulder, or one that slips

Leave out the leg pull front while your shoulder hurts, as its page says, do the scapular push-ups against a wall, and leave out the Y of the Y-T-W raises, as our weightlifters class suggests. After a dislocation, start the doorway stretch with the elbow low and stop at any feeling of the shoulder slipping, as its page says. Our Pilates for shoulder pain guide has more.

Sources 71, 72

After a pec or biceps tendon injury

Leave out the leg pull front, the knee hover and push-up moves until your surgeon or physiotherapist clears pushing (our suggestion).

Back pain that's worse arching

Tuck your tailbone under in the hip flexor stretch, keep the bridges to a height your back is happy with, and see our pain guides for back pain from deadlifts or squats (our suggestion).

High blood pressure or heart disease

Keep breathing in planks and holds. With heart disease, ask your cardiac team before long holds; with heart failure, avoid planks, as the plank pages say.

Heat, hard dieting and the week before a show

No hot Pilates or other heated classes, and never use a class to sweat off water (our suggestion, from the NHS dehydration and heat pages).

Sources 73, 74

Leaking when you lift

Do the pelvic floor squeezes most days, and see a pelvic health physiotherapist if it continues; our Pilates for the pelvic floor guide has more.

Chest pain or fainting: call 999

Call 999 if:

• You get sudden pain or discomfort in your chest that doesn't go away; it can feel like squeezing or pressure, burning or indigestion.
• The pain spreads to your left or right arm, or your neck, jaw, stomach or back.
• You have chest pain and feel sweaty, sick, light-headed or short of breath.
• Someone faints while exercising, can't be woken within 1 minute, or has chest pain or a pounding, fluttering or irregular heartbeat.

Sources 75, 76

Chest pain that comes and goes

Get help from NHS 111: pain or tightness in your chest, neck, shoulders, jaw or arms that comes and goes, often brought on by exercise, stress, emotion or cold and easing after a few minutes' rest. It can be angina, a sign of a heart problem. If you've been diagnosed with angina, get help from NHS 111 too if it feels worse than before, is happening more often, lasts longer or happens when you're resting.

Source 77

A sudden, severe headache: call 999

Call 999 for a headache that "started suddenly and is extremely painful", or one with weakness in the face, arm or one side of the body, trouble speaking or loss of vision. Ask for an urgent GP appointment or call NHS 111 for a headache "triggered or made worse by coughing, sneezing, bending down or exercising".

Source 78

Sudden weakness or paralysis: call 999

Dangerously low potassium has paralysed bodybuilders, one after a large binge in the days after a competition, and doctors are advised to consider diuretics as a cause. Sudden muscle weakness or paralysis, especially around a show, is a 999 call (our reading of these cases).

Sources 67, 68

Dark urine or very painful muscles

Dark, red or cola-coloured urine, much less urine than usual, or very painful, weak or swollen muscles in the days after a session or a binge need medical help the same day, as our rhabdomyolysis guide explains.

Source 68

Dehydration and heat

Ask for an urgent GP appointment or call NHS 111 if you feel unusually tired, dizzy when you stand up and it doesn't go away, or have dark yellow pee. Call 999 for confusion, cold or blotchy skin, or fast breathing.

The NHS says to call 999 for signs of heatstroke: still being unwell after 30 minutes of resting somewhere cool, being cooled and drinking; a very high temperature; hot skin that isn't sweating; a fast heartbeat; fast breathing or breathlessness; confusion and lack of coordination; a seizure; or loss of consciousness.

Sources 73, 74

A pop with weakness

A sudden pop with weakness at the chest, upper arm, elbow or above the knee needs checking the same day. Call 999 or go to A&E (accident and emergency) if the injured part has changed shape or is pointing at an odd angle, or is numb or tingling.

Source 79

A shoulder that slips or won't move

Call 999 or go to A&E: after a fall or injury, or after the bar came down on you or the shoulder slipped during a press, your shoulder looks out of place or has changed shape, or you cannot move your arm. Do not drive yourself, and do not try to put it back in yourself.

Same day (GP or NHS 111): sudden or very bad shoulder pain; you cannot move your arm; the arm or shoulder is badly swollen or has changed shape; pins and needles that do not go away; no feeling in the arm; the arm is hot or cold to the touch; pain that started after an injury such as a fall; or severe pain in both shoulders.

See a doctor or physiotherapist if your shoulder has partly or fully come out of joint, or you worry it might, including a clunk or a feeling it will slip with the arm low and back at the bottom of a press.

Sources 72, 71

Back pain with numbness, or weakness in a leg

Call 999 or go to A&E: loss of feeling or numbness around the genitals or bottom, new trouble peeing or controlling your bladder or bowels, changes in genital sensation during sex or problems with erections or orgasm, or pain, tingling, weakness or numbness in both legs. These are signs of cauda equina syndrome, which needs treating in hospital urgently. Don't drive yourself.

Same day: leg weakness that is getting worse.

Same day (urgent GP appointment or NHS 111): new difficulty lifting the front of your foot or toes (foot drop), or a foot that slaps down or catches as you walk, especially if it is getting worse. Weakness in both legs, or with numbness around the genitals or bottom or bladder or bowel changes, is the 999 emergency above.

Pain, tingling or numbness spreading below the knee that isn't settling after a few weeks, is getting worse or stops your normal activities: see a GP.

Sources 80, 81

Numbness, tingling or weakness in an arm

Same day (urgent GP appointment or NHS 111): severe neck pain that starts suddenly or gets worse quickly; heaviness or weakness in the arms or legs; pins and needles in an arm along with neck or arm pain; or pain between the shoulder blades.

Source 82

Worrying about your size, eating or drugs

It may be muscle dysmorphia, a form of body dysmorphic disorder. The NHS says to see a GP if you think you might have BDD, and Beat supports men as well as women.

Steroids, SARMs, insulin, thyroid hormones, clenbuterol and diuretics all carry serious risks. A GP can help, and Talk to FRANK gives confidential advice.

Our eating disorders guide explains the warning signs of an eating disorder and where to get help.

Sources 83, 84, 85, 86, 87

Thoughts of harming yourself

If you are thinking about suicide or can't keep yourself safe, call 999 or go to A&E. For urgent help, call Samaritans free on 116 123, any time, or in England call 111 and select the mental health option. In the US, call or text 988.

Sources 88, 89, 90

Before the hardest sessions

The PAR-Q+ (Physical Activity Readiness Questionnaire for Everyone) asks about a heart condition or high blood pressure, chest pain, dizziness or losing consciousness, other long-term conditions and their medicines, a bone or joint problem that activity could make worse, and being told to exercise only under supervision. If you answer yes to any, check with your GP or a qualified exercise professional first. If you're over 45 and not used to hard exercise, ask a qualified exercise professional before the hardest sessions, and delay if you're ill.

Source 91

Unusual breathlessness

Call 999 or go to A&E (accident and emergency) straight away for severe difficulty breathing (gasping, choking or not able to get words out), a chest that feels tight or heavy, pain that spreads to your arms, back, neck and jaw, lips or skin turning very pale, blue or grey, or sudden confusion. If you're more short of breath than usual, or your heart is racing, fluttering or skipping beats, contact NHS 111.

Source 92

During a session

A joint pain that is sharp, gets worse during a session, lingers into the next day or changes how you move is a reason to use an easier version, and to see a GP or physiotherapist if it keeps happening (the rule in our plans).

Source 93

Stop the session if

You feel any pain or become unwell, as the NHS advises for its Pilates videos, and especially for chest pain or pressure, unusual breathlessness, dizziness or fainting. If you have a health problem, an injury or any symptoms, get advice from a healthcare professional, such as a GP, before you start.

Source 94

Before you start

The NHS advises getting advice from a healthcare professional first if you have a health problem, an injury or symptoms, or have recently had a heart attack or an operation.

Source 94

"Pilates builds muscle like lifting does"Emerging evidence

Lean mass didn't change in pooled Pilates trials, resistance training beat Pilates for strength in older women, and no study has tested Pilates in people who already lift. Muscle grows with hard sets close to failure, and enough of them each week.

Sources 3, 4, 28, 29, 7, 8

"Pilates can't build any muscle"Mixed evidence

Also wrong as a blanket rule: in one small scan study without a comparison group, 36 weeks of Pilates grew inactive women's six-pack muscle by 21%, and Pilates built strength about as well as other exercise in people who weren't training. For someone who already lifts, the gain would be small at best (our reading).

Sources 5, 23

"Pilates gives you long, lean muscles"Emerging evidence

Lean mass didn't change in pooled trials, and months of stretching lengthened muscle fibres a little without thickening the muscle. "Long and lean" describes a look, and no exercise changes where a muscle attaches.

Sources 3, 4, 44

"Stretching between sets, or Pilates, adds size"Mixed evidence

Long-term stretching added a little muscle only at high doses, a loaded stretch between bench press sets did nothing in trained men, and an expert panel doesn't recommend stretching as a main way to build muscle.

Sources 10, 43, 47, 9

"Pilates builds a natural weightlifting belt"Emerging evidence

Unsupervised mat Pilates thickened the deepest tummy muscle only during Pilates moves, and in a lab model, bracing the whole trunk, not that muscle, stiffened the spine.

Sources 2, 50

"Pilates flushes out lactic acid and speeds recovery"Mixed evidence

A Pilates teachers' body's blog says Pilates aids "lactic acid removal", but 4 weeks of gentle mat Pilates didn't significantly change lactate in active women, stretching didn't reduce soreness, and light activity reduced it in only a few small studies. A rest-day class can feel good; it isn't a treatment.

Sources 95, 66, 16

"A strong core prevents all injuries"Strong evidence

"Definitive evidence demonstrating an association between core instability and injury is lacking". The programmes that cut sports injuries trained strength and balance, and stretching didn't help.

Sources 96, 97

"Pilates will make you smaller or weaker"Mixed evidence

No study shows it: lean mass didn't change in pooled trials, and short Pilates-style stretches didn't change strength in trained young adults. Long holds just before heavy sets cost a few per cent of force, so time it.

Sources 3, 25, 11

"Pilates is too easy for bodybuilders"Mixed evidence

It's light on the heart and lungs (2.8 METs, against 6.0 for vigorous weight training), but slow trunk endurance and long-lever holds are hard for many strong lifters, and trunk training improves trunk endurance most. It's a different kind of hard.

Sources 18, 31

"You need a reformer for real Pilates"Mixed evidence

In the one trial that compared them in athletes (30 young footballers), both mat and reformer Pilates improved tests, the reformer a little more on three. The springs add adjustable load, but your lifting already gives you more.

Source 98