Polycystic ovary syndrome

Also called: PCOS

Exercise is the main treatment Strength

Irregular periods, excess androgen effects and difficulty losing weight - with insulin resistance underneath most of it. Skeletal muscle is the main lever on insulin sensitivity, which is why resistance training treats a hormonal condition.

How common: 8-13% of women of reproductive age; the commonest endocrine disorder in that group

Open the Weight, Cholesterol & Metabolic Health routine All problems

What it is

PCOS is diagnosed on a combination of irregular ovulation, signs of excess androgens, and polycystic-appearing ovaries on ultrasound. Behind those features, in the majority of women, sits insulin resistance - and it is present in lean women with PCOS as well as in those carrying extra weight.

The mechanism is a loop. Insulin resistance drives higher insulin levels, high insulin stimulates the ovaries to produce more androgens and lowers the protein that binds them, and the resulting androgen excess worsens body composition and insulin resistance further. Breaking into that loop anywhere improves everything downstream, and exercise breaks into it at the muscle.

What it feels like

Irregular, infrequent or absent periods
Acne, and excess hair growth on the face, chest or abdomen
Thinning hair on the scalp
Weight that gains easily around the middle and is difficult to lose
Difficulty conceiving, which is often what prompts the diagnosis

What causes it

Most people have more than one of these at once, and they feed each other. Read the list looking for the two or three that sound like your week rather than for the one true answer — the ones that describe you are the ones worth acting on.

Insulin resistance: Present in a large majority of women with PCOS, including lean ones. High circulating insulin drives ovarian androgen production directly, which is the engine of the syndrome.
Low muscle mass and inactivity: Skeletal muscle is where most insulin-stimulated glucose disposal happens. Less active muscle means more insulin is needed for the same effect, which feeds the loop.
Excess androgens: Raised testosterone and related hormones produce the acne, hair growth and hair loss, and disrupt ovulation. They are largely a consequence of the high insulin rather than an independent problem.
Central body fat: Visceral fat worsens insulin resistance and produces inflammatory signals. Weight gain worsens PCOS and PCOS makes weight gain easier, which is a genuinely unfair loop and worth naming as such.
Genetics: PCOS clusters strongly in families. It is not caused by anything a woman did, and that matters, because it is frequently framed as though it were.
Disrupted hormonal signalling from the brain: Altered pulsatility of the hormone signals from the pituitary favours androgen production over ovulation, which is part of why cycles become irregular.
Low-grade chronic inflammation: Inflammatory markers are elevated in PCOS independently of weight, and inflammation itself worsens insulin resistance.
Sleep apnoea: Substantially more common in PCOS and it worsens insulin resistance independently. It is under-diagnosed in women generally and particularly here.
Stress: Sustained cortisol worsens insulin resistance and central fat deposition, both of which feed the underlying mechanism.

Who tends to get it

Women with a family history of PCOS or type 2 diabetes
Anyone with irregular periods and signs of androgen excess
Women carrying weight around the middle
Women of South Asian background, in whom it is more common and more metabolically severe
Anyone with sleep apnoea or a sedentary lifestyle

What makes it worse, and what settles it

Makes it worse

Inactivity, which removes the main lever on insulin sensitivity
Very restrictive dieting without resistance training, which loses muscle and worsens the underlying problem
Poor sleep and untreated sleep apnoea
Chronic stress
Being told simply to lose weight without being told how, which is what most women report receiving

Settles it

Resistance training, which builds the tissue that determines insulin sensitivity - the highest-value intervention here
Regular aerobic exercise, which improves insulin sensitivity independently of weight change
Modest weight loss of around five per cent, which can restore ovulation in a meaningful proportion of women
Treating sleep apnoea where present
Working with a clinician on medical options, which are effective and are not a failure to have needed

What actually helps

The short version: Insulin resistance drives androgen excess; skeletal muscle is the main lever on insulin sensitivity

Strength work: Full Body; Legs: Quads; Glutes; resistance training 2-3x/week

Stretching: Secondary

Massage: Secondary

Also worth doing: Aerobic exercise; sleep; the benefit appears even without weight loss

What the evidence says: Exercise is first-line in the international PCOS guideline. Resistance training improves insulin sensitivity and androgen profile independent of weight change - important because weight-loss-only advice fails this group repeatedly.

The names above are the Targets qFIT tracks — the Muscle Guide explains what each one does, and Quick Add switches on the Exercises you already have.

The qFIT routine for this

Ready-made routineWeight, Cholesterol & Metabolic Health

qFIT already has this one built. It runs massage first, then stretching, then strength — the order that works on a body that is already sore — and every activity in it carries the reason it is there.

The button below opens your Checklist with this routine already selected, so instead of your whole list you land on just its Categories, Targets and Exercises, each with its checkbox, ready to tick as you work through them.

Open this routine in my Checklist

Have more than one problem? Tick yours under My Problems on My Profile and your Checklist's Routine list gains Recommended for my problems — every routine for the problems you picked, merged into one. Your picks stay private; that filter is the only thing they feed.

Get it checked if…

New or worsening irregular cycles, or difficulty conceiving, needs endocrine and gynecology input alongside exercise

And whatever the body part: chest pain or unusual breathlessness on exertion; a fever alongside the pain; unexplained weight loss; pain that is constant and unrelated to how you move; new numbness, weakness or loss of bladder or bowel control; or one calf that is swollen, warm and painful. Any of those, stop and get assessed.

How it usually goes

Exercise improves insulin sensitivity within weeks and menstrual regularity often follows over three to six months, sometimes with weight loss of only around five per cent. Resistance training in particular improves body composition, androgen levels and metabolic markers in trials. PCOS is a long-term condition that is managed rather than cured, and the metabolic risks - type 2 diabetes, fatty liver, cardiovascular disease - are the reason to keep the training going long after the symptoms settle.

Prevalence basis: International PCOS guideline estimates

Others the same routine covers

These share the Weight, Cholesterol & Metabolic Health routine, so the work is the same. If one of them also sounds like you, that is a reason to expect more from it, not less.

This is general information, not a diagnosis, and it cannot examine you. If it matches you, use it to ask better questions of a clinician rather than to replace one.

← All 267 problems 🪯 Muscle Guide