Methods to improve skeletal muscle content, mainly including control diet and exercise, as follows: First, control diet: strict control of diet, minimize the intake of carbohydrates as well as fat, so that protein intake is significantly enhanced, can promote the growth of skeletal muscle, while controlling the growth of fat, so that the skeletal muscle content is significantly increased. Second, exercise: strengthen muscle strength and intensity training, such as resistance training, can assist elastic bands, sandbags, dumbbells, barbells, etc., through resistance can make the skeletal muscle tear, in nutritional support, can promote the rapid growth of skeletal muscle. Through the above methods, it can make the normal population skeletal muscle content significantly increased, while the fat content significantly reduced, can make the patient more healthy. The function of the joints around the skeletal muscles can be protected to avoid damage to the joints and to slow down joint degeneration.