Physical Activity and Cancer Risk

Moving your body regularly is one of the simplest ways to lower cancer risk. People who are physically active have a lower risk of several cancers than people who are not active.

Physical activity means any movement that uses energy. It does not have to be a sport or a gym workout. Walking, gardening, dancing, and housework all count.

Moving more and sitting less is good for your health and can lower your cancer risk.

The strongest evidence links regular activity to a lower risk of:

• Colon cancer
• Breast cancer
• Uterine (endometrial) cancer

Research also suggests that activity may lower the risk of other cancers, such as bladder, esophageal, kidney, stomach, and lung cancers. Scientists are still studying these links.

Being active helps in several ways at once:

• Weight. Activity helps you reach and keep a healthy weight, and extra body fat is tied to many cancers.
• Hormones. It lowers levels of hormones like estrogen and insulin that, when high, can help some cancers grow.
• Inflammation. It reduces ongoing inflammation in the body.
• Digestion. It helps food and waste move through the colon, which may lower colon cancer risk.

National guidelines suggest that adults aim for:

• At least 150 to 300 minutes of moderate activity each week, or
• 75 to 150 minutes of vigorous activity each week, and
• Muscle-strengthening activities on 2 or more days a week

Moderate activity makes you breathe harder but you can still talk, like brisk walking. Vigorous activity, like running, makes it hard to say more than a few words.

If that sounds like a lot, do not worry. Any amount of activity is better than none, and you can build up slowly over time. Breaking it into short sessions, like three 10-minute walks, still counts.

Sitting for long stretches, called sedentary behavior, is not good for health. Even if you exercise, long hours of sitting can add risk.

Try to break up sitting time. Stand up, stretch, or take a short walk during the day. Small changes, like taking the stairs or parking farther away, add up.

For many people who have had cancer, staying active is helpful. Research shows it can:

• Boost energy and reduce fatigue
• Improve mood and quality of life
• Help maintain strength and a healthy weight

For some cancers, activity may even improve outcomes. If you have or had cancer, ask your care team what level of activity is safe and helpful for you. They can suggest a plan that fits your situation, and a physical therapist or exercise program can help you start safely.

Fitting in activity does not require big changes all at once. Small, steady habits are easier to keep and still add up over time. A few ideas:

• Take a short walk after meals, on your own or with someone.
• Get off the bus a stop early, or park farther from the door.
• Use stairs instead of the elevator when you can.
• Turn chores like cleaning, raking, or gardening into your movement for the day.
• Pick something you enjoy, whether that is dancing, swimming, or playing with grandchildren.

If you have not been active for a while, start gently and build up. It can help to set a small, clear goal, like a 10-minute walk most days, and grow from there. The best activity plan is one you can stick with, because the benefits come from doing it regularly over the long run.

Consistency matters more than intensity. A daily habit of moderate movement does more for your health than an occasional hard workout followed by long stretches of sitting.