The purpose of this study is about cancer prevention and exercise to examine the literature and to provide a basis for cancer prevention following conclusions were intended. Exercise is a positive impact on cancer prevention. Obesity and reduce exercise of the body and the glucose and insulin secretion of sex hormones reduces the risk of reducing the occurrence of cancer, immune function, enhance activation of immune cells to increase in cancer cells serves to enhance radar. also Estrogen or hormone to reduce the exposure to body fat reduction, the increase in bowel movements, and increase the anti-tumor immune defenses against cancer risk julindago reported. Thus the cancer preventive exercise by giving a positive effect was confirmed. For a variety of exercise for cancer prevention research are needed.