The proportion of muscle to body weight, depending on the gender of different occupations and different, in general, the proportion of female muscle to body weight is about 30%, male muscle to body weight is about 40%. Professional athletes muscle to body weight ratio of up to 50%, or even higher. Muscle is divided into smooth muscle, muscle of the heart and skeletal muscle three. Heart muscle and smooth muscle is generally distributed in the internal organs and blood vessels, these muscles each person (accounted for the proportion) up and down not much. Skeletal muscle varies widely with people’s different occupations and the physical work they perform.