Reduces Fatigue in Cancer Patients.

An analysis of 56 studies involving over 4,000 cancer patients discovered that aerobic exercise, such as walking or cycling, reduces fatigue in those undergoing treatment. Fatigue is a common and problematic side-effect of cancer and cancer treatment. This exhaustion may last for months or years and make a patient less inclined to continue any further treatment. Previously, doctors recommended rest to treat cancer-related fatigue; as it turns out, the proper course may be physical activity.
The Cochrane Library, November, 2012