The human body generates forward power by paddling.
The way to improve the speed is to reduce the resistance as much as possible, and depilation is a common method for swimmers. The bionic shark skin was also developed to achieve this goal. It can reduce the resistance by forming vortex through tiny wrinkles on clothes.
Swimming requires a high level of cardiopulmonary function. In the case of hypoxia, glucose is oxidized to get lactic acid, which is easy to accelerate the feeling of acid swelling. Luo Xuejuan, a famous swimmer in China, was forced to retire because his cardiopulmonary function was not allowed.
Swimming is one of the best ways to lose weight, which can not only ensure the whole body's activities in the water, but also reduce the injuries caused by exercise.