Yes, research suggests men on hormone therapy for prostate cancer can build and preserve muscle with the right training. In a 2010 randomised trial by Galvao and colleagues, men on hormone therapy who did a supervised 12-week resistance and aerobic programme gained lean muscle and were stronger than a usual-care group. Hormone therapy makes this harder, not impossible.

Can you build or preserve muscle while on hormone therapy?

Yes, it is possible. Hormone therapy tends to work against muscle, but supervised exercise can push in the other direction. Studies of men having this treatment have shown that a structured programme of resistance and aerobic exercise can help them maintain muscle mass, and in some trials build a little more.

It helps to separate two ideas here. Building muscle means adding to what you have. Preserving it means holding on to what is already there while something works against you. On hormone therapy, both matter, and both are worth aiming for. Lean muscle mass is simply the weight of your muscle rather than fat. It is the part of you that carries you up stairs, lifts the shopping and keeps you steady on your feet.

The clearest example comes from a 2010 randomised controlled trial by Galvao and colleagues. Men on hormone therapy for prostate cancer, whose cancer had not spread elsewhere in the body, took part in a supervised 12-week programme that combined resistance (strength) training with aerobic exercise. Compared with a group who carried on as usual, the men who exercised gained lean muscle mass and grew stronger.

A wider look supports this. In a 2022 review by Shao and colleagues, which pooled the results of 12 separate trials involving 715 men on hormone therapy, exercise produced a small but real average gain in lean muscle mass, and a small average drop in body fat, compared with men who did not exercise. No single session does this on its own. The gains in these studies came from steady, repeated work over several weeks.

Why does hormone therapy make muscle harder to keep?

Hormone therapy for prostate cancer, sometimes called androgen deprivation therapy, or ADT, works by lowering the level of testosterone in the body. Testosterone plays a part in building and keeping muscle, so when it falls, muscle can slowly slip away and body fat can rise.

This is a known, expected effect, not a sign that anything has gone wrong. In a 2002 study by Smith and colleagues, men who were followed over about a year of hormone therapy tended to lose lean muscle mass and gain body fat across that time. Understanding this helps explain why exercise matters here. If muscle is under pressure, the sensible response is to give it a steady reason to stay.

Some men notice the shift as clothes fitting differently, or as feeling weaker doing things that used to be easy. That is a physical change driven by the treatment, not a failing on your part. Naming it plainly can take some of the worry out of it, and it points towards something you can act on.

The full picture of how hormone therapy changes muscle is worth reading on its own. You can find a plainer explanation in our companion piece on muscle loss on hormone therapy.

How does testosterone affect muscle?

Testosterone is a sex hormone, one of the group known as androgens, and it has a direct hand in muscle. It helps the body build and repair muscle tissue, which is why testosterone levels matter for muscle mass and for muscle strength.

The mechanism is worth a plain word. Testosterone supports muscle protein synthesis, the process the body uses to build new muscle protein and mend muscle fibres after effort. When testosterone levels are low, that process slows, and muscle becomes harder to gain or hold. This is the biology behind the muscle changes many men notice on hormone therapy.

Exercise reaches some of the same ground by another route. Resistance training gives muscle fibres a reason to adapt, and that is part of why structured strength work can support muscle growth even when testosterone is low.

What does the research show about strength and physical function?

Studies show that men on hormone therapy who do supervised strength work tend to get stronger and find everyday movement easier, even when they feel tired.

Physical function is a plain idea dressed in a technical phrase. It means how well your body does ordinary jobs, such as rising from a chair, carrying bags or keeping your balance on an uneven pavement. When strength holds up, these stay within reach, and that is often what men value most.

In the 2010 Galvao trial, the men who exercised gained lean muscle. They were also measurably stronger, and they moved more easily in simple tasks such as walking. Strength and steadiness on your feet are the things that make day-to-day life feel manageable.

A larger 2003 trial by Segal and colleagues, involving 155 men on hormone therapy, points the same way for strength. Men who did resistance exercise three times a week for 12 weeks had greater upper-body and lower-body strength than a comparison group. In that trial the exercise did not change body composition, so it is best read as evidence for strength rather than muscle size. The same men also reported less fatigue and a better quality of life.

That last point matters if tiredness is your main worry. Strength work can feel like the last thing you want to do when you are fatigued, yet it is one of the things shown to help. If fatigue is where you are starting from, our articles on why hormone therapy causes fatigue and what helps and how long that fatigue tends to last are a good next read.

What kind of exercise helps build muscle on hormone therapy?

Resistance training, sometimes called strength training or weight training, is the core. Paired with aerobic exercise such as walking or cycling, it is the approach named in national guidance.

The National Institute for Health and Care Excellence (NICE) is clear on this. Its guideline for prostate cancer, NG131, recommends that men starting or having hormone therapy are offered supervised resistance and aerobic exercise at least twice a week for 12 weeks, to reduce fatigue and improve quality of life. Resistance training is a named, guideline-backed element, not an optional add-on.

International expert guidance agrees. The 2019 ACSM roundtable, a consensus statement from an international group of exercise-oncology experts led by Campbell and colleagues, recommends both resistance and aerobic exercise for people with cancer, matched to the outcome you are working on, such as fatigue, quality of life and physical function.

There is useful detail in the research on which type does what. In the 2022 Shao review, resistance training on its own was strongest for preserving muscle mass, while combining resistance with aerobic exercise was best for reducing body fat. In practice this is why the exact mix, the load and the pace are set for you rather than copied from a leaflet.

Load is the amount you lift or push against. Progression means nudging that load up little by little as your body adapts, so the work stays useful without becoming a strain. Getting that balance right is where a supervised plan earns its place, because the weight that is right for one man in one week can be the wrong weight for another. You can read what national guidance says in plain English in our note on what NICE recommends for exercise on hormone therapy, and see the wider picture on the prostate cancer exercise guidelines page.

How long before there might be a change?

Most of the trials ran their programmes over about 12 weeks, with two or more supervised sessions each week. Change was measured over weeks, not days.

NICE frames the same window: supervised resistance and aerobic exercise at least twice a week for 12 weeks. Twice a week across 12 weeks works out at roughly 24 supervised sessions, which is the shape most of the evidence is built on. That is a guide to the effort involved, not a fixed rule.

More recent work points in the same direction over a slightly longer window. In a 2023 trial by Houben and colleagues, a 20-week supervised resistance programme increased muscle mass and strength, and reduced fat mass, in men on hormone therapy. The message across these studies is steady rather than dramatic. Muscle responds to regular, progressive work, and the men who saw gains kept going week after week.

Progressive simply means the work grows with you. Starting gentle and adding a little over time is how the body is coaxed to change, and it is also the safest way in. A missed week is not a setback that undoes everything. What counts is coming back and picking the thread up again.

If you are not sure where to begin, you can talk it through first in a paid 15-minute online video consultation.

Is it safe to do resistance training during hormone therapy?

In the supervised trials, it was well tolerated. In the 2010 Galvao trial, no exercise-related harms were reported during testing or the 12-week programme. Even so, safety depends on your own situation, so the first step is always to check with your care team.

A few things are worth holding in mind. The reassuring safety record comes from supervised programmes, where the exercises, the load and the progression were set and watched by a specialist. It does not automatically extend to heavy lifting done alone. The men in the 2010 trial also had prostate cancer that had not spread elsewhere in the body, so if your cancer is more advanced, your care team should guide closely what is safe for you.

A specialist watches your form, sets a load that suits the day you are having, and eases off if something does not feel right. That is a different thing from following a video at home with no one there to check. Supervision is also where any worries, such as a new ache or a heavy-fatigue day, get talked through rather than pushed past.

It helps to be plain about what exercise is doing here. Exercise rehabilitation supports side-effect management; it is not a cancer treatment. It works alongside the care your oncologist provides, never in place of it. You can read more in our article on whether exercise is safe during prostate cancer treatment.

How one-to-one specialist exercise rehabilitation can help

Knowing that muscle can be built and kept is only the start. Turning that into safe, steady strength work takes a plan shaped around where you are now. Specialist exercise rehabilitation is where that shape becomes real sessions built around you.

Piotr Kardas is a Prostate Cancer Exercise Specialist, Registered Clinical Exercise Physiologist. He works one to one with men who have prostate cancer, and with survivors. Each programme is built around supervised resistance and aerobic exercise, with the load adjusted as you go. Within that plan, Piotr integrates progressive resistance training with methods such as Tai Chi, Qigong, and Clinical Pilates. These sit inside the programme, chosen and adjusted for you, never as standalone products.

Piotr delivers specialist exercise rehabilitation for men with prostate cancer, at a world-leading NHS cancer centre, as a clinical exercise physiologist. Sessions run one of two ways: online by video call anywhere in the UK, or as a home visit in London or Surrey, arranged with Piotr and priced for your circumstances. Many men find a programme like this hard to arrange alone, and a specialist is one way to build it around you.

If you’d like to talk it through, you can book a paid 15-minute online video consultation with Piotr. It’s a calm, private space to ask your questions.

Before you begin

Exercise is not a treatment for prostate cancer, and this article is general information only. Always consult your oncologist or consultant before beginning any exercise programme.

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