Patients in both arms undergo assessment of their aerobic capacity and strength by the 6-minute walk test and handgrip dynamometry at baseline and at day 41. They also have a fasting blood draw and wear an actigraph for one week at baseline and week 6. Patients complete Functional Assessment of Chronic Illness Therapy-Fatigue and -Cognitive Subscales, Brief Fatigue Inventory, Multidimensional Fatigue Symptom Inventory, Center for Epidemiological Studies-Depression Scale State Trait Anxiety Inventory, Pittsburgh Sleep Quality Inventory, Profile of Mood States, Aerobic Center Longitudinal Study Physical Activity, and Symptom Inventory questionnaires at baseline and at day 41 and keep a daily exercise diary during study intervention.