How much exercise is recommended for cancer prevention?

The general recommendation for cancer prevention is 150 to 300 minutes per week of moderate-to-vigorous intensity aerobic exercise. Benefits accrue up to 300 minutes, after which the curve tends to plateau. Vigorous intensity exercise is often given double credit, meaning 75 minutes of vigorous activity can be equivalent to 150 minutes of moderate activity.

Does exercise before a cancer diagnosis improve outcomes after diagnosis?

Yes, studies suggest that exercise before a cancer diagnosis can improve outcomes afterward, independently of post-diagnosis activity. This pre-diagnosis exercise might lead to less aggressive or earlier-stage cancers, delay cancer onset, and prepare the body (prehabilitation) for treatments, reducing complications and improving recovery.

Why is muscle mass important for cancer patients?

Low muscle mass is a critical factor driving cancer recurrence and death. Cancer can cause sarcopenia or muscle wasting, which resistance training can modestly benefit. Building muscle reserves through strength training before a diagnosis can also provide a buffer against the rapid decline in muscle mass during treatment and recovery.

How does exercise help patients undergoing chemotherapy?

Exercise helps cancer patients complete more of their chemotherapy treatments by reducing side effects like fatigue, improving sleep quality, and decreasing anxiety and depression. Studies show that patients who exercise during chemo have fewer dose reductions and delays, which increases the chance of cure and lowers recurrence risk.

What are the biological mechanisms by which exercise fights cancer?

Exercise influences primary tumors by improving blood vessel quality and density, enhancing chemotherapy and radiation delivery, and increasing tumor oxygenation. It also reduces circulating tumor cells through increased shear stress from blood flow, lowers metabolic signals like insulin and IGF that fuel cancer growth, and boosts immune system surveillance by natural killer cells and T-cells.

Can exercise be used as a standalone treatment for certain cancers?

Emerging research, particularly in prostate cancer patients on 'active surveillance' (where low-grade cancers are monitored without immediate treatment), shows promise for exercise as a monotherapy. High-intensity interval training has been shown to lower PSA levels and reduce the growth of prostate cancer cells in vitro.

Are oncologists now recommending exercise to their patients?

Yes, there is growing evidence, including randomized controlled trials published in top cancer journals, that supports exercise for cancer patients. In 2022, the American Society of Clinical Oncology (ASCO) released its first exercise guidelines, recommending aerobic and resistance exercise for all cancer patients treated with curative intent.

What are some potential harms or risks of exercise in cancer patients?

While the benefits generally outweigh the harms, exercise can sometimes exacerbate symptoms like skin irritation (from radiation), diarrhea, or hand-foot syndrome. Patients with bone metastases face an increased risk of fracture, requiring careful exercise prescription. Also, high sun exposure during outdoor exercise increases skin cancer risk for exercisers.

What is the single best exercise if I only have 15 minutes a day to fight cancer?

If you have only 15 minutes a day, focusing on strength training with heavier compound lifts (like squats) is recommended. This targets lean muscle mass, which is extremely important for treatment tolerance, predicting recurrence and survival, and maintaining physical functioning and quality of life.

The Science of Exercise for Cancer | Kerry Courneya, PhD

FoundMyFitness

Science & Technology4 min read109 min video

Mar 5, 2025|74,964 views|2,017|156

exercise cancer oncology prostate cancer breast cancer high-intensity interval training cancer treatment cancer therapy weight training resistance training chemotherapy chemo

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Key Moments

TL;DR

Exercise is a pillar of cancer care, impacting prevention, treatment, and survivorship with numerous benefits.

Key Insights

Exercise is crucial for cancer prevention, with smoking cessation, managing obesity, and reducing alcohol consumption being top priorities, followed by regular physical activity.

During cancer treatment, exercise helps manage side effects like fatigue, improves treatment tolerance, and can lead to better survival rates.

Resistance training is vital for maintaining muscle mass, crucial for counteracting cancer cachexia and improving outcomes, especially during treatment.

Exercise can positively impact the immune system's ability to combat cancer cells and improve the efficacy of treatments like chemotherapy and radiation.

For individuals on active surveillance for low-grade cancers, exercise may help slow tumor growth and delay the need for more aggressive treatments.

Exercise offers significant psychological benefits for cancer patients, including reduced fear of recurrence, increased sense of control, and improved overall mental well-being.

EXERCISE AS A PILLAR OF CANCER CARE

Exercise has transitioned from a peripheral consideration to a fundamental component of cancer care, encompassing prevention, treatment, and survivorship. Its benefits extend across numerous physiological systems, reducing the risk of various chronic diseases and aiding in the management of existing conditions. Research increasingly highlights exercise's role in directly impacting cancer outcomes, underscoring its importance for both overall health and specific oncological management approaches.

LIFESTYLE STRATEGIES FOR CANCER PREVENTION

Preventing cancer involves several key lifestyle changes. Smoking cessation remains the most impactful action to reduce cancer risk significantly and rapidly. Obesity is the second leading risk factor, and its rising prevalence is concerning, driving an increase in obesity-related cancers. Alcohol consumption is also a notable risk factor. Following these, regular moderate-to-vigorous intensity aerobic exercise, for at least 150-300 minutes per week, is recommended. While strength training also shows benefits, aerobic activity is the primary focus. Exercise can lower the risk for specific cancers like colon, breast, and endometrial cancer, regardless of obesity status or even in smokers, though its impact is less compared to quitting smoking.

IMPROVING CANCER TREATMENT TOLERANCE AND OUTCOMES

During cancer treatment, exercise is not just about feeling better; it's a critical intervention that improves treatment tolerance and outcomes. Counterintuitively, exercising rather than resting can reduce treatment-related fatigue, a common and debilitating side effect. Patients who exercise during chemotherapy often complete more of their prescribed treatment, with fewer dose reductions or delays, which is linked to better cure rates and lower recurrence risk. Weight training, in particular, has shown promise in helping patients maintain lean muscle mass, which is crucial for metabolizing chemotherapy drugs and overall prognosis. Exercise also improves sleep quality, reduces anxiety and depression, and can potentially help with peripheral neuropathy.

THE ROLE OF EXERCISE IN COMBATING METASTASIS AND CACHEXIA

Exercise plays a multifaceted role in preventing cancer spread (metastasis) and mitigating muscle wasting (cachexia). Studies suggest that increased blood flow during exercise can create shear stress on circulating tumor cells, leading to their death and reducing their ability to form new tumors. Furthermore, exercise can improve the vascularity and oxygenation of primary tumors, potentially enhancing the effectiveness of chemotherapy and radiation therapy. For muscle mass, resistance training is vital. Low muscle mass is a strong predictor of cancer recurrence and death, and maintaining or building muscle can help patients survive treatment and potentially live longer, even in cases of metastatic disease, contributing to the concept of 'reserves'.

EXERCISE AS MONOTHERAPY AND IN ACTIVE SURVEILLANCE

Emerging research is exploring exercise as a standalone therapy, particularly for low-grade, early-stage cancers managed through active surveillance. In prostate cancer patients on active surveillance, high-intensity interval training has shown potential to lower prostate-specific antigen (PSA) levels, possibly by influencing prostate cancer cells via metabolic and immune mechanisms. This approach aims to delay the need for traditional treatments, thereby improving quality of life and reducing overtreatment. While exercise is not a universal cure and can exacerbate certain symptoms or risks in specific contexts, its overall benefits in slowing tumor growth and spread are widely supported by preclinical and emerging clinical data.

PSYCHOLOGICAL BENEFITS AND EXERCISE PRESCRIPTION

The psychological benefits of exercise for cancer patients are profound, often rivaling or even exceeding its physical effects in patient-reported outcomes. Exercise can restore a sense of control and normalcy during a disorienting time, significantly reducing anxiety, depression, and the pervasive fear of cancer recurrence. For survivorship, exercise aids in recovery and helps manage the increased risk of secondary chronic diseases like cardiovascular disease. While recommendations vary, aiming for the higher end of guidelines (up to 300 minutes of moderate-intensity or 150 minutes of vigorous-intensity exercise per week) generally yields greater benefits. For those with limited time, focusing on strength training within a 15-minute window is suggested. Key to successful implementation is personalized prescription, professional guidance, and strong support from the oncology team.

THE FUTURE OF EXERCISE IN ONCOLOGY

The integration of exercise into standard cancer care is rapidly advancing, supported by growing evidence and professional guidelines from organizations like the American Society of Clinical Oncology. While challenges remain, particularly in funding and ensuring access for all patients, especially those new to exercise or undergoing intense treatment, the trend is positive. Ongoing large-scale randomized controlled trials are further solidifying exercise's role in improving disease-free survival and cost-effectiveness. Researchers are actively investigating optimal exercise types, intensities, and frequencies for different cancer types and treatments, with a continued focus on evidence-based approaches to maximize patient benefit across the entire cancer continuum.

Mentioned in This Episode

●Software & Apps

●Tools

●Organizations

●Studies Cited

●Concepts

●People Referenced

Exercise for Cancer Patients: Dos and Don'ts

Practical takeaways from this episode

Do This

Incorporate 150-300 minutes per week of moderate-to-vigorous intensity exercise for prevention and treatment.

Prioritize resistance training to build and maintain muscle mass, especially before, during, and after cancer treatment.

Engage in high-intensity interval training (HIIT) if feasible, as it robustly activates biological changes relevant to cancer growth.

Combine aerobic and resistance exercise for potential additive benefits.

Seek support from oncologists, oncology nurses, and community-based programs like Livestrong at YMCA for structured exercise guidance.

Educate yourself on cancer-specific benefits of exercise to maintain motivation.

Wear sunscreen and protective clothing during outdoor exercise to mitigate skin cancer risk.

Avoid This

Don't rely solely on light intensity 'background activity' as a substitute for structured exercise.

Don't assume all exercise is universally beneficial; be aware that some intensities or types might exacerbate symptoms or, in rare animal models, accelerate tumor growth.

Don't take a cancer diagnosis as a reason to become sedentary; resting often leads to more fatigue and poorer outcomes.

Don't ignore symptoms like skin irritation, diarrhea, or peripheral neuropathy; adapt exercise prescriptions with medical guidance.

Don't overtrain to extreme levels (e.g., marathon running) during treatment, as it can cause immunosuppression.

Common Questions

The top lifestyle changes for cancer prevention are: quitting smoking, managing obesity, and reducing alcohol consumption. Once these major factors are addressed, regular exercise and a healthy diet become the next most important steps, with exercise helping reduce the risk of 8-10 types of cancer.

Topics

Exercise Oncology Cancer Treatment Smoking Metastasis Immunotherapy Chemotherapy Radiation Therapy Active Surveillance Psychological Health Fear Of Recurrence Circulating Tumor Cells Liquid Biopsy Prostate Cancer Breast Cancer

Mentioned in this video

otherActive Surveillance

An approach to managing small, low-grade, slow-growing cancers without immediate treatment, pioneered in prostate cancer, where lifestyle interventions like exercise can play a significant role.

personDr. Kerry Courneya

Professor and Chair at the University of Alberta in Canada, and a leading researcher in exercise oncology.

otherProstate-Specific Antigen (PSA)

Blood levels used to screen for prostate cancer and indicate tumor presence; high-intensity exercise has been shown to lower PSA levels in men on active surveillance.

organizationAmerican Cancer Society

An organization that estimates 40% of cancer diagnoses could be prevented through optimal lifestyle choices and provides resources on exercise for cancer patients.

studyErase Trial

A study that showed exercise can reduce the fear of cancer progression or recurrence in patients.

studyBRCA1/BRCA2 genes

Genetic predispositions mentioned for increasing the risk of breast cancer.

otherAndrogen Deprivation Therapy (ADT)

A primary treatment for prostate cancer that eliminates testosterone, but can lead to muscle weakness; weight training is effective in countering these side effects.

otherImmunotherapy

A new treatment approach that stimulates the immune system to track down and kill cancer cells; exercise is described as an 'original immunotherapy'.

otherSarcopenia

A phenomenon of muscle wasting, especially in advanced or metastatic cancer, which is critically linked to recurrence and death from cancer.

toolLiquid biopsies (Grail test)

Blood tests that detect small numbers of circulating tumor cells or circulating tumor DNA, offering potential for earlier cancer detection or recurrence monitoring.

organizationAmerican Society of Clinical Oncology (ASCO) Guidelines

Guidelines released in 2022 recommending aerobic and resistance exercise for all cancer patients being treated with curative intent.

organizationMD Anderson Cancer Center

A leading cancer treatment center that has exercise specialists and programs for cancer patients.

otherInsulin-like growth factor (IGF)

A metabolic signal mentioned that helps cancer cells grow and divide, and can be reduced by exercise.

studyRectal cancer study

A human study where patients who exercised during chemoradiation therapy were more likely to have a complete response, meaning tumors were completely gone before surgery.