Swimming is aerobic exercise and consumes a lot of calories. This is because the heat transfer in water is 28 times that in air, and the heat consumed by people staying in water for 8 minutes is the same as that consumed by staying in air at the same temperature for 2 hours. So it has a better slimming effect. In addition, swimming makes the body get full exercise. When swimming, the human body is lifted by the buoyancy of water, and the hands and feet are used together, so that the joints and muscles of the whole body are evenly coordinated, and all parts of the human body are stretched, making the body more symmetrical.

2. technical movements are very important when swimming. If the technical movements are not standardized, not only the purpose of exercise can not be achieved, but also the muscles to be exercised can not be exercised, which is often called "partial" exercise. For example, swimming depends mainly on the strength of the legs. The enhancement of leg strength plays a key role in performance, but many people only pay attention to the upper limb movements when swimming, and the legs are basically motionless. This not only makes swimming difficult, but also makes the legs that can provide power a burden.