Running, walking and bicycling could help people with cancer to beat a common side effect of both the disease and its treatment, according to a new review of studies. "The evidence suggests that exercise may help reduce cancer-related fatigue and should therefore be considered as one component of a strategy for managing fatigue that may include a range of other interventions and education," study researcher Fiona Cramp, of the University of the West of England, said in a statement.The review included 56 studies, half of which were included in a previous review published in the Cochrane Library, that analyzed the impacts different kinds of exercise had on cancer-related fatigue (half of the studies dealt specifically with breast cancer-related fatigue).