At present, in the gender distribution of physical fitness population in China, the proportion of men is higher than that of women, reaching 59.8%. In terms of age distribution, the proportion of 25-44 years old exceeds 70%, and young and middle-aged people carry the main flag of exercise and fitness. Fitness exercises can be effective from the age of eight to sixty, or even seventy. China bodybuilding experts believe that people aged 25-44 generally have the best bodybuilding effect. But for those who require muscular development and bodybuilding, it is best to start bodybuilding exercise from the age of seventeen or eighteen until the age of fifty. Bodybuilding is closely related to people's physical beauty, and bodybuilding is the basis of physical beauty. Symmetrical shape, balanced proportion, smooth lines, strong bones, well-proportioned limbs, full figure, elastic muscles and healthy skin color are all indispensable conditions for physical beauty. Bodybuilding also needs abundant spirit, happy mood and youthful vitality. A beautiful human body should be a combination of health, strength and beauty. A beautiful body should be healthy. Without a healthy body, there is no physical beauty. Only a healthy and symmetrical human body image can show the beauty of birth, vitality and abundant energy and become the carrier of human essential strength. To have a strong body, we should take an active part in physical exercise and proper physical labor. Because a healthy body can be obtained through acquired exercise. People's body structure is perfect, with great plasticity. Necessary nutrition, regular participation in labor and persistent physical exercise are the conditions for bodybuilding. Can make all parts of limbs develop symmetrically, muscles will be strong and elastic, joints will be flexible, body shape will be perfect, and complexion will be rosy.