Yes, exercise during cancer treatment is safe and beneficial for most patients. Research shows it reduces fatigue, anxiety, and depression, improves quality of life, speeds recovery after surgery, and may even improve survival in some cancers. Aim for about 150 minutes of moderate activity per week, such as walking, cycling, or light strength training.
For many years, doctors have told people to exercise to lower their risk of getting cancer. They have also encouraged cancer survivors to stay active after treatment. But what about during treatment? Is it safe? Does it really help?
The good news is clear: exercise during cancer treatment is not only safe for most people — it is helpful.
In 2022, the American Society of Clinical Oncology (ASCO) released the first official guidelines for exercise during active cancer treatment. Experts reviewed more than 100 clinical trials. Their conclusion was strong and reassuring. People who stayed physically active during chemotherapy, radiation therapy, or both had fewer side effects and better quality of life.
That is powerful information.
The Benefits of Exercise During Treatment
Cancer treatment can be hard on the body. Many people feel tired, weak, anxious, or depressed. Some struggle to keep up with daily activities like cooking, shopping, or even walking around the house.
Exercise helps in several important ways:
• Reduces fatigue
• Lowers anxiety and depression
• Improves mood
• Maintains muscle strength
• Improves balance
• Helps people recover faster after surgery
• Improves overall quality of life
One of the biggest surprises for many patients is that exercise actually reduces cancer-related fatigue. When you feel exhausted, your first thought may be to lie down and rest. While rest is important, too much rest can actually make fatigue worse. Gentle movement can boost energy levels and help you feel stronger.
Exercise also helps people return to their normal daily routines more quickly. Staying active keeps muscles from shrinking and helps protect the heart and lungs during treatment.
Exercise May Even Improve Survival
In 2025, a major study published in the New England Journal of Medicine gave even more exciting news. Researchers found that exercise improved disease-free survival and overall survival in people with colon cancer who had completed chemotherapy.
This was important because it was a randomized controlled trial — the highest level of scientific evidence. This type of study reduces bias and gives stronger proof that the results are real.
Earlier studies suggested exercise might improve survival after cancer. But this was the first time a high-quality trial showed clear evidence.
While more research is still needed for other cancers, this study gives hope that exercise may do more than just improve symptoms. It may actually help people live longer.
How Does Exercise Help Fight Cancer?
Scientists are still learning exactly how exercise works inside the body during cancer treatment. But several important changes happen when we move.
First, exercise lowers inflammation. Chronic inflammation is linked to several types of cancer. Reducing inflammation may help slow cancer growth.
Second, exercise lowers insulin levels. High insulin levels are linked to some cancers. Keeping insulin in a healthy range may reduce risk.
Third, exercise improves blood flow. Better blood flow may help chemotherapy drugs reach tumors more effectively.
Exercise also boosts the immune system. Cancer can weaken immune function. Physical activity increases the movement of immune cells that help attack cancer. It may even help certain immunotherapy treatments work better.
All of this shows that exercise is not just about feeling better. It may change how the body responds to cancer and treatment.
How Much Exercise Do You Need?
The general recommendation is 150 minutes of moderate exercise per week.
That sounds like a lot, but it breaks down to about 30 minutes a day, five days a week.
Moderate exercise means you can talk, but you cannot sing. If you can sing, you are going too easy. If you cannot speak at all, you are working too hard.
If 30 minutes feels overwhelming, you can break it up into smaller sessions. For example:
• 10 minutes in the morning
• 10 minutes after lunch
• 10 minutes in the evening
Short sessions still count. What matters most is consistency.
Of course, every person is different. Your cancer type, treatment plan, side effects, and current fitness level all matter. Always talk with your oncology team before starting or changing an exercise routine.
What Type of Exercise Is Best?
The ASCO guidelines recommend two main types of exercise:
1. Aerobic Exercise
Aerobic activity strengthens the heart and lungs. Examples include:
• Walking
• Cycling
• Swimming
• Dancing
• Light jogging
Walking is often the easiest place to start. It requires no special equipment and can be done almost anywhere.
2. Resistance (Strength) Training
Strength training keeps muscles strong. Cancer treatment can cause muscle loss, especially during chemotherapy.
Examples include:
• Light hand weights
• Resistance bands
• Body weight exercises like wall push-ups or chair squats
Both aerobic and strength exercises work together to support health. Aerobic exercise supports heart health. Strength training protects muscles and bones.
How to Start Safely
If you have not been active for a while, do not jump straight into 150 minutes per week. Start slowly.
Begin with 5 to 10 minutes of light walking. Add a few minutes each week. Listen to your body. Some days will feel better than others.
It is normal to have ups and downs during treatment. If you feel very tired or nauseated, shorten your session. Even gentle stretching or slow walking around the house is better than complete inactivity.
The goal is progress, not perfection.
What If You Feel Too Tired?
This is one of the biggest challenges. When you are exhausted, exercise feels like the last thing you want to do.
But even small amounts of movement can reduce fatigue over time. Many patients report that once they start moving, they actually feel better.
Think of exercise as medicine. You do not have to run a marathon. You just need steady, gentle movement.
The Benefits Continue After Treatment
The positive effects of exercise do not stop when treatment ends.
Research shows that cancer survivors who stay active after treatment continue to experience:
• Better mood
• Less fatigue
• Improved physical function
• Better overall quality of life
Exercise becomes part of long-term recovery and survivorship.
Final Thoughts
Cancer treatment is challenging. It can drain your energy and affect your mood. It may feel strange to think about exercise during this time.
But the science is clear.
Exercise during cancer treatment is safe for most people. It reduces fatigue, lowers anxiety and depression, improves strength, speeds recovery, and may even improve survival in some cancers.
Start slow. Move gently. Stay consistent.
Even small steps can make a big difference.
And remember — always speak with your cancer care team before starting a new exercise plan. Together, you can find a routine that supports your body through treatment and beyond.