During the summer, due to the climate, the human physical exertion is greatly increased. Under such unfavorable weather conditions, if people do not properly arrange fitness plans and exercise in a scientific manner, the result may not be very satisfactory. How should we reasonably arrange the summer season? What about fitness programs? The best choice for fitness in summer is in the morning and evening when the temperature is low, because during this period of exercise, the muscle viscosity within the body is the weakest, and the flexibility of the joint is relatively strong, which can achieve very scientific training purposes. If you exercise at a hot time from noon to 4 pm, you will not achieve a good exercise goal, but will also hurt the body. It is recommended to do more "mild exercise" in summer. There are many forms of "mild exercise", such as brisk walking, jogging, aerobics, swimming, cycling, mountain climbing, twisting Yangge, ballroom dancing, and bowling. Their common feature is low intensity. It is rhythmic, long-lasting, uninterrupted, and has no difficult skills and is easy to maintain. Long-term adherence to "mild exercise" can gradually increase the amount of hemoglobin in the body, improve body resistance, delay aging, enhance cerebral cortex work efficiency and cardiopulmonary function, prevent arteriosclerosis, and reduce the incidence of cardiovascular and cerebrovascular diseases. "Gentle exercise" belongs to aerobic exercise, which can increase the body's oxygen uptake and promote heart and lung function. Individuals can choose according to their own preferences, but should not feel tired after each exercise. Studies have shown that aerobic exercise can not only reduce the risk of serious illness, speed up recovery after an injury or illness, but also reduce the risk of wrestling because aerobic exercise maintains muscle capacity, balance, and coordination. Don't immediately take a cold shower or blow fans and air conditioners after exercise. Because after the exercise, the metabolism of the tissues and organs of the body is accelerated, and the capillaries in the skin are greatly expanded. At this time, if a cold shower or an electric fan is immediately taken, the capillaries contract immediately when they are cold, and the sweat glands close, which not only makes the person feel even more intolerable. It will also disrupt the normal function of the internal organs, and it is easy to catch colds and colds.