PCOS and working out when the weight won't move

PCOS was renamed polyendocrine metabolic ovarian syndrome (PMOS) in 2026. We explain the change in PCOS is now PMOS. In this article we use PCOS because that’s still what most people search for.

“I’m sick of people telling me well at least you maintained your weight”

That frustration makes sense. PCOS often comes with insulin resistance, and many women with PCOS find weight harder to shift than their friends do. The guideline even tells doctors to be aware of weight stigma when they talk about lifestyle. You’re dealing with physiology, and it’s fair to be tired of hearing about the scale.

Does exercise help PCOS if I’m not losing weight?

Yes. The 2023 International Evidence-based Guideline for PCOS (Teede et al.) says a healthy lifestyle brings benefits even without weight loss, and recommends physical activity for all women with PCOS. It also says there isn’t enough evidence to call any one type or intensity of exercise the best.

Exercise and Sports Science Australia published a PCOS position statement in 2024. It says exercise can improve central fat and lower cardiovascular risk independent of meaningful weight loss, and that it improves insulin sensitivity and quality of life.

What does exercise actually do for insulin resistance in PCOS?

Muscle is one of the main places your body uses glucose. When you train, your muscles get better at pulling glucose out of the blood, which is what better insulin sensitivity means in practice. That effect fades within about three days of your last session, which is why regular training matters more than one big week.

A network meta-analysis published in BMC Women’s Health in early 2026 pooled 23 randomized trials with 1,192 women with PCOS. Moderate-intensity continuous training (think brisk walking, cycling or an easy jog for longer sessions) significantly lowered insulin resistance. Both moderate cardio and HIIT clearly improved aerobic fitness, with HIIT a little ahead, and HIIT lowered fasting insulin. And BMI? Neither changed it significantly. Two other recent network meta-analyses found HIIT lowered insulin resistance too. The evidence quality is low to moderate, so treat this as a direction and keep an eye out for newer trials.

The training improved the metabolic marker and the fitness marker, and the scale barely moved. That’s a common result, and it means the work is paying off where it counts.

Is strength training good for PCOS?

The guideline recommends muscle-strengthening activity on at least 2 non-consecutive days a week, on top of cardio. In the recent meta-analyses, strength training on its own didn’t clearly lower insulin resistance, so it works best alongside cardio. You also get stronger, which you can measure every week, and that’s a much kinder number to watch than bodyweight.

Can working out help my mood with PCOS?

Anxiety, depression and body image struggles are more common in women with PCOS, and the ESSA statement asks exercise professionals to keep that psychological load in mind. Regular exercise is linked to better quality of life in PCOS.

What to do in the gym

The guideline’s targets for adults are 150 to 300 minutes of moderate activity a week or 75 to 150 minutes of vigorous activity, plus strength work at least twice a week. If you’re starting out, pick 4 to 5 sessions from the list below and build from there. A week that fits real life could look like this:

• 2 to 3 strength sessions, with a rest day between them. Squat or leg press, hinge (RDL or hip thrust), a push, a pull. 3 sets of 8 to 12 reps, stopping each set with about 2 reps left in the tank. When you hit 12 reps on every set, add a little weight and go back to 8.
• 2 to 3 cardio sessions of 30 to 45 minutes at a pace where you can talk. Incline walking, cycling, easy jogging. This is the one type of training that lowered insulin resistance in all three recent meta-analyses.
• 1 short HIIT session if you enjoy it. Warm up for 5 minutes, then do 6 to 8 rounds of 30 seconds hard and 90 seconds easy on a bike. If you’re new to cardio, give yourself 3 to 4 weeks of steady sessions first.
• Yoga or Pilates on stressful weeks. It still counts, and it’s easier to keep going than to restart.
• Walk after meals when you can. Ten minutes is enough to start. Walking after eating can help your body handle the rise in blood sugar, and three short walks a day add up to about 30 minutes toward your weekly total.

Track things that move: how many reps you get at a set weight, how long you can walk at a steeper incline, how you slept, how you feel. If the numbers go up across two or three months, you’re getting fitter and stronger.

When to see a doctor

• Your cycles are very irregular, very far apart, or stop for 3 months or more.
• You have signs of high blood sugar, like being very thirsty or peeing a lot.
• Hair growth, acne or hair loss is changing quickly, or your voice gets deeper.
• Your mood is low most days, or eating feels out of control. If you ever have thoughts of harming yourself, call or text 988 (US) right away.
• You haven’t been tested for things like glucose, cholesterol and blood pressure in a while. The guideline recommends regular checks for women with PCOS.

How Phasly handles PCOS

Phasly has a PMOS (PCOS) mode. It works from the periods you actually log, so irregular cycles don’t break it. It includes training cards built for insulin sensitivity (HIIT with zone 2 cardio, combined strength and cardio, yoga and Pilates for stress) and a PCOS symptom list you can track, including irregular cycles, carb cravings, weight changes and hirsutism. A daily 30-second check-in (energy, sleep, mood, symptoms) adjusts the day’s workout. Phasly launches on iOS and Android in November 2026. Join the waitlist below.

Common questions

Can you improve insulin resistance with PCOS without losing weight?

Yes. In a 2026 meta-analysis of 23 trials, moderate cardio lowered insulin resistance in women with PCOS while BMI didn't change significantly.

What is the best exercise for PCOS?

The 2023 guideline says no single type has been shown to be best. A mix of strength training and cardio you can keep doing is a strong choice.

How much exercise is recommended for PCOS?

150 to 300 minutes of moderate activity or 75 to 150 minutes of vigorous activity a week, plus strength work on at least 2 days.