Being overweight or obese is linked to 13 different types of cancer. On the other hand, up to one hour of moderate activity per day or 30 minutes of vigorous activity each day can help reduce your risk of cancer.
In fact, exercise is important to reduce the risk of many cancers, such as colon cancer, where exercise can help you move through the waste products faster, reducing contact with carcinogens. High activity levels through exercise can also help lower estrogen levels in the body, reducing the risk of breast cancer.
Exercise also prevents tumor growth in general, as if your body is physically active, it will produce less insulin and insulin-like factors that accelerate tumor growth.