There are many ways of resistance training, such as equipment training and free weight training (dumbbells, barbells, etc. ), elastic belt and self-weight training (such as push-ups, squats and sit-ups, etc. The purpose of resistance training is to gradually increase the load of musculoskeletal system and make it strong. The benefits of regular resistance training can enhance the strength of bones, develop and strengthen muscle tissue and make the body stronger. Any form of exercise plan (except specialized aerobic exercise and flexible exercise) should include strength training. The main function of aerobic exercise is to strengthen cardiopulmonary function; Strength training is a kind of balanced exercise, which mainly challenges the muscle groups in all parts of the body, including pectoralis major, arm muscles, back muscles and upper body abdominal muscles.