Walking is the simplest aerobic exercise that people often do. It contracts and relaxes regularly through many muscle groups such as legs, back and buttocks. Exercise heart and lung function, improve blood circulation, and drive more oxygen into the tissues and organs of the whole body, thus playing the role of exercise. In recent years, walking in drizzle has become more and more popular. Research shows that walking in rain or light rain in Mao Mao is much better than walking in sunny days, which is more beneficial to human body. Rain can wash away dust and pollutants in the air and make the air fresh and clean. Rain can produce a lot of negative ions, which makes people feel refreshed and relaxed. Drizzle can massage people's faces. In addition, walking in the rain can improve the excitement of the nervous system and promote metabolism, thus enhancing immunity and adaptability to changes in the external environment. If you walk in the light rain without cover, the time should not be too long, about 30 minutes is appropriate. Old people are not fit to walk in the rain.