Exercise and cancer: is it safe, and what does it do?

Yes, exercise is safe for most people with cancer, before, during and after treatment. Macmillan, Cancer Research UK and the international ACSM guideline all say so, and no large trial has found that exercise makes cancer worse. What it does do is reduce fatigue, improve mood and fitness, and in some cancers it appears to improve survival. The key is a programme matched to your treatment and your body.

Exercise is one part of cancer rehabilitation, alongside eating well and emotional support. This guide covers the exercise part.

Can you exercise with cancer?

For most people, yes. Macmillan's guidance is direct: "Being active before, during and after cancer treatment is safe" [1]. Cancer Research UK says the same: "International guidelines say it is safe to be active during cancer treatment and after" [2].

The 2019 international roundtable convened by the American College of Sports Medicine concluded that "exercise training and testing were generally safe for cancer survivors" and that every survivor should "avoid inactivity" [3].

Can exercise make cancer worse?

There is no good evidence that it does. In the CHALLENGE trial, people who exercised after bowel cancer treatment had fewer recurrences and deaths, not more [5].

What exercise can do is aggravate a treatment side effect if it is done without regard to it. Macmillan lists the situations that need care: low platelets, low white cells, cancer in the bones, peripheral neuropathy and lymphoedema [6]. These are reasons to adjust the programme, not to avoid exercise, and a trained cancer exercise professional screens for them. See also lymphoedema and exercise.

Exercise during treatment

Working around treatment cycles and blood counts is covered in exercise during chemotherapy. Here is the evidence in brief. A major international guideline from the American Society of Clinical Oncology (ASCO), based on 52 systematic reviews and 23 further randomised trials, found that exercise during treatment "led to improvements in cardiorespiratory fitness, strength, fatigue, and other patient-reported outcomes". It says "oncology providers should recommend regular aerobic and resistance exercise during active treatment with curative intent" [7].

The same guideline found that exercise before lung cancer surgery reduced hospital stay and post-operative complications [7]. That is the basis of prehabilitation.

During treatment, expect to do less than when you are well, and to rest when you need to [6]. Macmillan's advice is: "Doing something is better than doing nothing. It is important to listen to your body and do what you feel able to do" [1].

Why is exercise good for cancer patients?

Exercise reduces cancer-related fatigue, the exhaustion that does not lift with rest, and it improves anxiety, low mood, physical function and quality of life [3, 8, 9]. Fatigue is the best-evidenced benefit, and in a large meta-analysis exercise worked better for it than the medicines tested [9].

Our guide to cancer-related fatigue covers that evidence in detail and how to start when you are exhausted.

Macmillan adds stronger muscles and better bone health, and notes that activity, along with a healthy diet, may lower the risk of some cancers coming back [1]. Effects on peripheral neuropathy and "chemo brain" remain uncertain [3].

Does exercise affect cancer?

Yes, it can, at least in bowel cancer. In the 2025 CHALLENGE trial, 889 people who had finished chemotherapy for colon cancer had either a three-year structured exercise programme or health-education materials. Five years on, 80.3% of the exercise group were alive without their cancer returning, against 73.9%; after eight years, 90.3% were alive, against 83.2% [5].

This is one trial in one cancer, so it does not prove the same for every cancer. The full results, including the side effects, are in exercise and bowel cancer; the evidence for breast cancer, prostate cancer and other cancers is on their own pages.

What cancer does exercise prevent?

Studies link regular activity with a lower risk of several cancers. They are observational studies in which people reported their own activity, so they show a link, not proof that exercise prevents cancer [10].

A large study pooled 12 cohorts (1.44 million adults, 186,932 cancers). Higher leisure-time activity was linked with lower risk of 13 cancers, including oesophageal adenocarcinoma (HR 0.58), liver (0.73), lung (0.74), kidney (0.77), endometrial (0.79), colon (0.84) and breast (0.90), and the authors note that "most of these associations were evident regardless of body size or smoking history". For lung cancer, though, the link depended on smoking status [10]. The same study found higher rates of malignant melanoma (HR 1.27) and slightly higher rates of prostate cancer (1.05) among the most active.

Cancer Research UK takes a more conservative line and names the three cancers with the strongest evidence: bowel cancer, breast cancer after the menopause, and womb cancer [2].

Can diet and exercise help cancer?

Exercise has much stronger evidence than any particular diet. The ASCO guideline reviewed 42 systematic reviews on exercise against nine on diet, and its firm recommendations were about exercise. On diet, its one clear finding was negative: "neutropenic diets did not decrease risk of infection during cancer treatment" [7]. That does not cancel food-safety advice from your own team: if your immunity is very low, they may ask you to avoid some foods for a while, and Macmillan says "It is important to follow their advice" [22]. Cancer Research UK notes that body fat and diet are among the factors that may affect the risk of cancer coming back, which is where exercise and eating well overlap [2].

Diet and the wider team. If eating is difficult, ask your hospital doctor or nurse to refer you to a dietitian; in some hospitals you can refer yourself [11]. Dietitians are the only nutrition profession regulated by law [12]. Your clinical nurse specialist usually co-ordinates your care and can refer you to other services that can help [13]. See nutrition during cancer treatment and your cancer rehabilitation team.

How much exercise for cancer patients?

The UK target for people with cancer is the same as for every adult: at least 150 minutes of moderate activity a week, or 75 minutes of vigorous activity, plus strength exercises on at least two days a week [1, 2, 4]. Treat it as something to build towards, not a starting point.

Cancer Research UK also suggests balance and flexibility work twice a week [2]. The UK Chief Medical Officers' guidance is explicit that "Any activity is better than none" and "more is better still", and that the benefits "outweigh the risks, even for most people living with long term conditions" [4].

The guidelines recommend combining aerobic and resistance exercise [3, 7]. Once treatment ends, exercise after cancer treatment covers getting your fitness back.

Who should you see?

Three kinds of professional usually deliver exercise in cancer care, and they often work together.

Clinical Exercise Physiologists (CEPs) prescribe and deliver evidence-based exercise for people with long-term conditions, including cancer [14]. They train through a one-year AHCS-accredited master's degree and can join the Academy for Healthcare Science (AHCS) voluntary register, which is accredited by the Professional Standards Authority but is not statutory regulation [14, 15, 16]. Macmillan describes a CEP as "an expert in screening, assessing and advising what physical activity is best for you and your situation" [1]. See what is a Clinical Exercise Physiologist.

Level 4 cancer rehabilitation instructors are fitness professionals who have added a CIMSPA-endorsed cancer rehabilitation course, such as the WRIGHT Foundation's five-day course, to a fitness qualification [17]. CanRehab runs its own Cancer and Exercise Rehabilitation Award [18]. Macmillan calls this role a cancer exercise specialist, "a fitness instructor who is qualified to help people with cancer to exercise safely", who might work in a gym or local leisure centre [1]. In The Health Nav's view, they are a good fit once your healthcare team has said exercise is safe for you. See cancer exercise programmes.

Physiotherapists are regulated by law: the title is protected and they must be registered with the HCPC [19, 21]. CEPs and physiotherapists have overlapping skills but different scopes, and the Chartered Society of Physiotherapy supports them working together [15, 20].

	Clinical Exercise Physiologist	Level 4 cancer rehabilitation instructor	Physiotherapist
Register	AHCS (voluntary, PSA-accredited) [15, 16]	No statutory register [20]	HCPC (statutory) [19]
Best for	Screening, assessment and exercise advice for long-term conditions, including cancer [1, 14]	Supervised exercise in gyms and leisure centres [1]	Injury, pain, movement problems, rehabilitation after surgery [21]
Where you usually meet them	Varies by area; through The Health Nav, in person in parts of south-west London or remotely	Gyms, leisure centres and community programmes [1]	Hospital or community, via your team or GP [2]

The full breakdown of the tiers explains how they differ.

When to be cautious / talk to your doctor first

Macmillan's advice is to talk to your cancer doctor, specialist nurse or GP if you are new to exercising or have any concerns [1]. Speak to them first, and tell your exercise professional, if you have:

• Low platelets or a low white cell count from chemotherapy [6].
• Anaemia (a low red blood cell count) [6].
• Cancer that has spread to bone [6].
• Peripheral neuropathy that affects your balance [6].
• Lymphoedema or a limb at risk of it [6].
• A stoma or wounds that have not fully healed [6].
• A heart or lung problem [6].
• Recent surgery: your surgeon or nurse will tell you which activities to avoid and for how long [6].
• A central line or PICC line: avoid swimming and vigorous upper-body exercise [6].
• Blood-thinning medicine: you will bruise more easily, so avoid high-impact activities and contact sports [6].

Stop exercising and get advice if you develop sudden dizziness, chest pain, a racing heart, breathing problems, feeling sick, unusual back, bone or muscle pain, or a headache that does not go away [6].

Related reading

• Cancer rehabilitation in the UK
• Cancer FAQs
• What a cancer exercise physiologist does (Health Hub)

Getting matched with a specialist

At the moment The Health Nav matches people with verified clinical exercise physiologists, in person in parts of south-west London and remotely across the UK. A CEP works alongside your NHS team, not instead of it. If you live in London, cancer rehab in London also covers NHS and charity options near you.

Request a match with a verified clinical exercise physiologist through The Health Nav. Questions first? Email support@thehealthnav.co.uk.

This article is general information and does not replace advice from your own healthcare team.

References

1. Macmillan Cancer Support. Physical activity and cancer. https://www.macmillan.org.uk/cancer-information-and-support/treatment/preparing-for-treatment/physical-activity-and-cancer (accessed 12 Oct 2026).
2. Cancer Research UK. Exercise and cancer. https://www.cancerresearchuk.org/about-cancer/coping/physically/exercise-guidelines (accessed 12 Oct 2026).
3. Campbell KL, Winters-Stone KM, Wiskemann J, et al. Exercise Guidelines for Cancer Survivors: Consensus Statement from International Multidisciplinary Roundtable. Med Sci Sports Exerc. 2019;51(11):2375-2390. https://doi.org/10.1249/MSS.0000000000002116
4. UK Chief Medical Officers. UK Chief Medical Officers' physical activity guidelines. Published 7 September 2019, updated 10 July 2026. https://www.gov.uk/government/publications/physical-activity-guidelines-uk-chief-medical-officers-report/uk-chief-medical-officers-physical-activity-guidelines (accessed 12 Oct 2026).
5. Courneya KS, Vardy JL, O'Callaghan CJ, et al; CHALLENGE Investigators. Structured Exercise after Adjuvant Chemotherapy for Colon Cancer. N Engl J Med. 2025;393(1):13-25. https://doi.org/10.1056/NEJMoa2502760
6. Macmillan Cancer Support. Exercising safely when you have cancer. https://www.macmillan.org.uk/cancer-information-and-support/treatment/preparing-for-treatment/physical-activity-and-cancer/exercising-safely (accessed 12 Oct 2026).
7. Ligibel JA, Bohlke K, May AM, et al. Exercise, Diet, and Weight Management During Cancer Treatment: ASCO Guideline. J Clin Oncol. 2022;40(22):2491-2507. https://doi.org/10.1200/JCO.22.00687
8. Cramp F, Byron-Daniel J. Exercise for the management of cancer-related fatigue in adults. Cochrane Database Syst Rev. 2012;11:CD006145. https://doi.org/10.1002/14651858.CD006145.pub3
9. Mustian KM, Alfano CM, Heckler C, et al. Comparison of Pharmaceutical, Psychological, and Exercise Treatments for Cancer-Related Fatigue: A Meta-analysis. JAMA Oncol. 2017;3(7):961-968. https://doi.org/10.1001/jamaoncol.2016.6914
10. Moore SC, Lee IM, Weiderpass E, et al. Association of Leisure-Time Physical Activity With Risk of 26 Types of Cancer in 1.44 Million Adults. JAMA Intern Med. 2016;176(6):816-825. https://doi.org/10.1001/jamainternmed.2016.1548
11. Macmillan Cancer Support. Eating problems and cancer. https://www.macmillan.org.uk/cancer-information-and-support/impacts-of-cancer/eating-problems (accessed 12 Oct 2026).
12. British Dietetic Association. Dietitian or nutritionist? https://www.bda.uk.com/about-dietetics/what-is-dietitian/dietitian-or-nutritionist.html (accessed 12 Oct 2026).
13. Macmillan Cancer Support. Macmillan nurses. https://www.macmillan.org.uk/cancer-information-and-support/get-help/macmillan-nurses (accessed 12 Oct 2026).
14. NHS Health Careers. Clinical exercise physiologist. https://www.healthcareers.nhs.uk/explore-roles/healthcare-science/roles-healthcare-science/physiological-sciences/clinical-exercise-physiologist (accessed 12 Oct 2026).
15. Chartered Society of Physiotherapy. Supporting the development of a Clinical Exercise Physiologist: FAQs. https://www.csp.org.uk/node/1303511 (accessed 12 Oct 2026).
16. Academy for Healthcare Science. PSA accredited register. https://www.ahcs.ac.uk/registration/psa-accredited-register/ (accessed 12 Oct 2026).
17. WRIGHT Foundation. Level 4 Cancer Rehabilitation. https://www.wrightfoundation.com/course/level-4-cancer-rehabilitation-09-12-25/ (accessed 12 Oct 2026).
18. CanRehab Education. https://canrehabeducation.co.uk/ (accessed 12 Oct 2026).
19. Health and Care Professions Council. The professions we regulate. https://www.hcpc-uk.org/about-us/who-we-regulate/the-professions/ (accessed 12 Oct 2026).
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21. NHS Health Careers. Physiotherapist. https://www.healthcareers.nhs.uk/explore-roles/allied-health-professionals/roles-allied-health-professions/physiotherapist (accessed 12 Oct 2026).
22. Macmillan Cancer Support. Food safety when your immunity is low. https://www.macmillan.org.uk/cancer-information-and-support/impacts-of-cancer/healthy-eating-and-cancer/food-safety-when-your-immunity-is-low (accessed 12 Oct 2026).