Body-building in water is an exercise activity in which human beings run, jump, squat, kick, pat, press and push in water by using the buoyancy, resistance and heat dissipation of water. It can make the muscles of the whole body get exercise, thus promoting health, strengthening physique, promoting the recovery from injuries and shaping the body. Besides swimming in traditional sports, you can also do walking, running, flexibility exercise, gymnastics, disco, aerobic exercise and weight-bearing exercise in water. Now, fighting, yoga, Tai Chi and other fitness programs that were originally carried out on land can be carried out in water. What are the benefits of fitness in water? Water training can improve people's muscle strength and body flexibility, improve people's cardiovascular system, respiratory system and other physical functions, and play a good role in physical fitness and rehabilitation for all kinds of people; It also has the function of shaping and beautifying the skin for women; Group exercises also help to promote communication between people, cultivate sentiment and relax. Regular exercise in water, especially aerobic exercise in water, will have a good influence on the heart. In addition, because of the strong heat dissipation of water, exercise in water can effectively increase the consumption of fat, and the weight loss effect is remarkable. In the water environment below body temperature, the pressure and resistance of water can promote the metabolism of human body and improve the blood circulation of skin. At the same time, the skin is rubbed and massaged with water, so that the skin elasticity is enhanced and wrinkles disappear. Therefore, for women, this is a very good fitness program. Is fitness in water better than on land? When doing some sports on land, due to the action of gravity, practitioners are easily injured by the strong stimulation of waist, knees and ankles. In addition, the elderly, patients with certain diseases, pregnant women, obese people and other people also have inconvenience or poor results in practicing on land. Doing various sports in the water may avoid the above injuries. Because the buoyancy of water can reduce the impact on the joints and spine of the body during exercise, give people a feeling of relaxation and comfort, and protect the joints of the human body. The test results show that water sports have excellent effects. Water resistance can develop muscle strength. Because people's resistance in water is much greater than that in air, it takes more than 6 times more power to complete the same set of actions in water than on land. In addition, the heat dissipation of water is more than 28 times that of air. The amount of heat consumed by a person who moves in water for 20 minutes is equivalent to more than 1 hour on land. Fitness in water can achieve twice the result with half the effort. Even people with sports injuries, after a period of practice, the pain disappeared.