People undergoing cancer treatment traditionally have been told to rest as much as possible and avoid exertion, to save all their strength to battle the dreaded disease.



But a growing number of physicians and researchers now say that people who remain physically active as best they can during treatment are more likely to beat cancer.



The positive evidence for exercise during and after cancer treatment has piled so high that an American College of Sports Medicine panel is revising the group's national guidelines regarding exercise recommended for cancer survivors.



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