Fitness refers to the exercise with bare hands or with the help of various instruments, which adopts special and scientific action methods to develop muscles, increase physical strength, improve body shape and cultivate sentiment. It can also improve human health, improve cardiopulmonary function and help postoperative recovery. There are many specific items, such as swimming, running, gymnastics, weightlifting and other common fitness exercises, which are simple and applicable, and can effectively enhance people's physique, improve people's health level, develop whole body muscle strength, enhance strength and improve production and labor efficiency; It can also improve people's body shape and posture and cultivate people's beautiful sentiments, so it is deeply loved by the people, especially those with high cultural knowledge. Today, when the national fitness campaign is being carried out, it has a strong attraction. It can make the weak strong, the obese strong, the children grow up healthily, and the elderly live a long and healthy life. Bodybuilding is an important aspect of national fitness, which is closely related to fitness. At present, we should pay special attention to the development of fitness among workers, farmers and soldiers, as well as among children and the elderly, in order to improve the health level of our nation.