Cancer and Exercise: Should You Train During Treatment?

Cancer is one of the biggest health challenges a person can face, and the conversation around exercise, nutrition, and lifestyle in cancer prevention and treatment has evolved significantly. Gone are the days when people were told to just rest—we now know that staying active can play a crucial role in both prevention and improving quality of life during treatment.

Understanding Cancer and Its Treatments

Cancer isn’t just one disease—it’s a collection of diseases that involve abnormal cell growth. There are different types of cancer treatments, including:

• Surgery – Removing tumors when possible

• Chemotherapy – Using drugs to kill cancer cells

• Radiation Therapy – Targeting cancer with radiation

• Immunotherapy – Boosting the body’s immune system to fight cancer

• Hormone Therapy – Blocking hormones that fuel certain cancers

• Targeted Therapy – Attacking cancer cells at a molecular level

Each of these treatments comes with unique side effects—fatigue, nausea, muscle loss, and immune suppression—which can impact how a person feels and moves during treatment.

The Role of Exercise During Cancer Treatment

One of the biggest questions people ask is: “Should I exercise while I have cancer?” The short answer? Yes, if you can.

The old belief was that cancer patients should avoid exertion, but research now shows that exercise can help in multiple ways, including:

✅ Reducing fatigue – Regular movement can actually combat cancer-related fatigue

✅ Preserving muscle mass – Preventing excessive muscle loss during treatment

✅ Improving mood – Exercise releases endorphins, helping with mental well-being

✅ Enhancing immune function – Supporting the body’s ability to fight infection

✅ Managing treatment side effects – Reducing nausea, neuropathy, and brain fog

✅ Improving quality of life – Keeping people independent and mobile

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That said, exercise should be adapted based on the type of treatment and how the individual is feeling. Some days, a short walk or stretching session might be enough. Other days, strength training and resistance exercises can help maintain function and strength.

How Cancer Develops: The Immune System and Environmental Factors

A newer theory of cancer suggests that our bodies are constantly creating cancer cells, but our immune system keeps them in check. When the immune system is compromised—due to factors like chronic stress, poor sleep, poor diet, excessive alcohol consumption, and lack of exercise—it may struggle to stop these cells from multiplying.

But lifestyle isn’t the only factor—environmental toxins and smoking also play a huge role.

Smoking and Cancer

Smoking is one of the most well-established causes of cancer, especially lung, throat, and mouth cancers. The chemicals in cigarettes cause DNA damage at a cellular level, leading to mutations that increase cancer risk. Even secondhand smoke can be harmful, which is why reducing exposure is key.

Environmental Toxins and Cancer Risk

Many chemicals in air pollution, processed foods, plastics, and household products have been linked to cancer risk. Things like:

• Pesticides and herbicides in food

• Heavy metals like lead and arsenic

• Endocrine disruptors in plastics (e.g., BPA)

• Industrial pollutants in air and water

While we can’t avoid all toxins, being mindful of what we consume, breathe in, and put on our skin can help reduce overall exposure.

Lifestyle Factors That May Help Reduce Cancer Risk

While there’s no guaranteed way to prevent cancer, research strongly supports the idea that certain lifestyle habits can lower risk and support treatment outcomes:

✔️ Eating a Nutrient-Dense Diet – Prioritizing whole foods, fiber, and antioxidants

✔️ Getting Quality Sleep – Supporting immune repair and cellular function

✔️ Managing Stress – Chronic stress impacts immune function and inflammation

✔️ Staying Hydrated – Supporting detoxification and cellular health

✔️ Regular Exercise – Keeping metabolism and immune function optimized

✔️ Avoiding Smoking & Reducing Toxin Exposure – Minimizing harmful environmental factors

Despite doing all the right things, some people will still get cancer, often due to genetic predisposition, environmental factors, or unpredictable stressors. This is why early detection through screenings and preventative check-ups is critical.

Should You Modify Exercise During Cancer?

Yes. The key is to listen to your body and work within your energy levels and capabilities. Some important considerations include:

• Adjusting intensity – Strength training can be beneficial, but it may need to be modified based on fatigue and recovery

• Prioritizing movement over exhaustion – On tough days, even gentle stretching or walking can help

• Being mindful of bone health – Some treatments weaken bones, making weight-bearing exercise even more important

• Managing nausea and dizziness – Exercising in shorter sessions or seated positions may be more comfortable

Final Thoughts

Exercise during cancer treatment isn’t about pushing through at all costs—it’s about maintaining strength, mobility, and quality of life. Even small amounts of movement can make a big difference in how a person feels.

And when it comes to cancer prevention, the goal isn’t just to avoid “bad” things—it’s to optimize the body’s natural ability to stay strong, resilient, and balanced.

If you or someone you know is facing cancer, focus on what’s within your control—nutrition, movement, sleep, stress management, and reducing toxin exposure—all of which play a role in supporting the body through one of its biggest fights. And if you want me in your corner, just email me.