After the Dragon Boat Festival, the weather gets hotter and hotter. According to the weather report, the daily maximum temperature is either 31 degrees or 32 degrees, which is really hot. The best activity to relieve heat is swimming, which is enjoyed by both adults and children, and it can relieve heat and exercise at the same time, killing two birds with one stone. Swimming is the most ideal whole-body exercise, each posture has the upper and lower flexion and extension, rotation, side opening and trunk flexion and rotation side action at the same time, the effect can not only promote the balanced development of the limbs, but also to promote the development of the body, and to promote the development of the body.