Through fitness can exercise the body, improve the immunity of the body, improve the function of the heart, respiratory system, gastrointestinal tract to prevent myocardial infarction, stroke, respiratory system diseases and gastrointestinal diseases. Through exercise can also be happy mood, eliminate worries and fatigue, generally like to exercise people have cheerful personality. Obese people through exercise can also eliminate excess body fat, increase muscle content to build a perfect body. Proper exercise, especially at night, can promote sleep and improve the quality of human sleep. The bad thing about exercise is that if you don’t warm up well before exercise or exercise in an incorrect way, it may cause some damage to muscles and joints. Therefore, fitness must be taken the right way, that is, a reasonable and scientific approach to fitness.