Muscle is the main factor in shaping physical beauty. Muscle beauty is mainly manifested in: muscle elasticity. Male chest is protruding, abdominal muscles are looming in blocks, arms are protruding, and wings are slightly winged; Female breasts are plump, stiff but not drooping, showing obvious female curves, flat abdomen, thin waist and strength, and no sagging buttocks; The thigh muscles are soft and the calves are long, and there is no sense of flexion when the legs are disturbed. Too fat, too thin, soft muscles and uneven development are not conducive to muscle beauty.

The plasticity of flesh and blood is great, and through exercise, especially bodybuilding, the bodybuilding of human muscles can be significantly shaped. This is because exercise increases the blood supply to muscles and promotes the absorption and storage of nutrients such as protein. In this way, muscle fibers become thicker, muscles become strong, powerful and elastic, and exercise also improves the control of the nervous system on muscles, making them agile and dexterous.

Bone is the scaffold of the body and plays a vital role in the beauty of the body. The bodybuilding of bones not only affects the height and figure, but also lays the foundation for the development of muscles and prepares the conditions for the development of internal organs.

The strength of bones is related to congenital inheritance, and it is also related to acquired labor and physical exercise. Regular exercise can invade the thickening of human tubular bone, increase bone tuberosity and nodules, and the arrangement of trabecular bone will also change adaptively. The bones become solid and the compression resistance is enhanced. In the growth stage, running and jumping can also stimulate the epiphyseal cartilage at both ends of the tubular bone of the lower limbs, make it flourish and promote bone growth, so reasonable exercise in adolescence is conducive to the growth of height.

The most important function of exercise on the skin is to enhance the blood circulation of the skin, promote the expansion of the cross-sectional area of blood vessels, facilitate the blood flow to the limbs, increase the blood flow of skin capillaries, make the skin get more nutrition, increase the ability of oxygen absorption and perspiration, and activate the metabolism of the skin. At the same time, the blood oxygen content increases during exercise, and the whole body cells, including skin cells, get more oxygen and nutrition. In addition, exercise can increase the skin temperature, which is beneficial to the synthesis speed of collagen fibers in the skin, promote the storage of water in skin cells, prevent the skin from drying and wrinkling, and make the skin look moist, delicate and moist. Finnish scholars made a study on two groups of middle-aged people, and found that the skin density, compactness and elasticity of one group who insisted on physical activities for a long time were higher than those of the other group who did not participate in physical activities. Dr. White of the University of California once used stereo photography to measure the number, depth, width and distribution of facial lines. He found that people who often take part in physical exercise have fewer facial wrinkles than those who don't exercise, and they are shallow and narrow, with good skin color and look younger.