The importance of exercise to physical health is well known to young and old alike, and there is a saying, “When you are young, trade your health for money, when you are old, trade your exercise for your health.” In addition to promoting blood circulation and reducing cholesterol production, exercise can also increase appetite, promote gastrointestinal motility, prevent constipation and improve sleep. It helps to have the habit of exercising consistently, preferably doing aerobic exercise. Aerobic exercise can lower blood pressure as well as weight loss, such as walking, jogging, tai chi, cycling and swimming are all aerobic exercises. 1, the precautions for exercise: ① Do not overdo or too strong too tired, to take a gradual approach to increase the amount of activity. ② Pay attention to the surrounding environment and climate: summer: avoid the sunny hours at noon; winter: pay attention to keep warm and prevent stroke. ③ Wear comfortable and sweat-absorbing clothes: choosing cotton clothing and sports shoes are necessary. ④ Choose a safe place; ⑤ When doing exercise, do not fast to avoid hypoglycemia, it should be 2 hours after meals. 2, the contraindications of exercise ① sickness or discomfort should stop exercise; ② hungry or within an hour after the meal should not do exercise; ③ exercise can not be stopped immediately, to comply with the steps of the exercise program; ④ any discomfort in the exercise, should be stopped.