Swimming is a whole-body exercise, which can not only lose weight, but also improve your heart and lung function. It can also exercise almost all your muscles, especially the regular intensive training. A few months of hard work can make you "reborn". In the water, people's bones are fully relaxed, and they can have the opportunity to "stretch", which is very beneficial to maintaining a tall and straight figure. For growing teenagers, regular swimming exercise can make you grow into a "tall man". (1) Swimming consumes a lot of energy. This is because the resistance of water when swimming is much greater than that of air when moving on land, so it is very difficult to walk in the water, and then swimming will definitely consume more calories. At the same time, the thermal conductivity of water is 24 times higher than that of air, and the water temperature is generally lower than that of air, which is also beneficial to heat dissipation and consumption. So swimming consumes much more energy than running and other land projects, so the effect of losing weight is more obvious. ⑵ It can avoid sports injuries of lower limbs and waist. When carrying out weight-loss exercise on land, because obese people are heavier, their bodies (especially lower limbs and waist) have to bear great gravity load, which reduces their exercise ability, is easy to fatigue, greatly reduces their interest in weight-loss exercise, and can damage joints and bones of lower limbs. When swimming in water, a considerable part of obese people's weight is borne by the buoyancy of water, which makes their lower limbs and waist much easier and greatly reduces the risk of joint and bone injury. ⑶ You can enjoy natural massage service: When swimming, the buoyancy, resistance and pressure of water are an excellent massage for the human body, and can also beautify the skin.