The role of swimming is more, usually recommended 3 times a week is appropriate, but the number of times is not fixed, there are individual differences, the number of people in good health can be increased. Swimming can improve the flexibility and flexibility of the human body, but also to reduce mental stress, relieve asthma, increase human lung capacity, etc.. Because swimming consumes more calories than running, it is more conducive to shaping, and more women are currently swimming to lose weight. But if you take swimming for weight loss, you must adhere to 3 times a week, and at least 45 minutes each time to achieve weight loss results. If the number of swimming is too frequent, it is easy to make excessive muscle damage, which does not meet the requirements of reasonable exercise. In addition, swimming is prohibited on an empty stomach and a full stomach, and the warm-up exercise must be done before swimming to avoid cramps and other abnormalities. At the same time, after swimming must shower to reduce the chances of infectious diseases, and women can not swim during menstruation to avoid infection.