Regular exercise not only reduces the risk of cancer. Physical training can also support the therapy of a tumor disease. An international consortium of researchers, including scientists from the German Cancer Research Center (DKFZ) and the National Center for Tumor Diseases (NCT) Heidelberg, has discovered: Patients who exercise regularly not only feel physically fitter and stronger, they also rate their own quality of life as better and suffer less frequently from chronic fatigue syndrome. However, some patient groups seem to benefit more than others.