The proposed study is a randomized trial evaluating the impact of the 12-week LIVESTRONG exercise program vs. waitlist control on cancer-related outcomes in 200 cancer survivors. Participants will undergo baseline testing at Dana-Farber or Yale, including administration of questionnaires to assess quality of life and the presence of cancer and treatment-related symptoms, fasting blood draw, and evaluation of body composition (using dual energy X-ray absorptiometry (DEXA). Participants will then take part in the 12-week LIVESTRONG Program or will be assigned to a wait-list control group. All measurements will be repeated at Dana-Farber or Yale after the 12-week exercise program or control period.