Swimming is a kind of whole-body exercise by using the buoyancy, resistance and friction of human body in water and the weightlessness of human body in water, which is suitable for all kinds of people. The intensity of swimming is similar to running. The heart rate per minute can be controlled at 180 minus age and minus 10. For example, for a person aged 15, the heart rate during swimming can be controlled at180-15-10 = 65438.