Because of earlier detection and improved treatments, survival times for many forms of cancer have improved dramatically. As a consequence, the population of cancer survivors is growing fast. Survivors now number over 12 million people, nearly 4% of the American population. The treatments for cancer, however, often leave people physically deconditioned, fatigued, and stressed. Oncologists increasingly recommended exercise to their patients as a way to combat treatment-induced side effects, to improve their quality of life, and, for some common forms of cancer, extend survival times. Yet, most fitness professionals lack the specialized knowledge about the disease, its treatments, and its side effects to work effectively with cancer patients and survivors. The purpose of this workshop is to provide personal trainers and group exercise instructors with the necessary expertise for helping this steadily growing population improve their physical function and achieve a higher quality of life.