That makes some doctors wonder if the same could hold true for more serious diseases, like cancer. Studies are under way to determine what effect, if any, strenuous exercise has on the body and what can be done about it. Most Americans, though, don't have to worry about this because they don't get enough exercise. Activity in moderate amounts is good for the body in a number of ways. It's good for muscle tone, the cardiovascular system and can help keep weight under control, which can play a role in preventing heart disease, high blood pressure and adult-onset diabetes.
Doctors believe that moderate exercise also can have a beneficial effect on the immune system.
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