Winter is suitable for fitness, because fitness improves immunity and is not easy to catch a cold. Exercise is to persist, all year round. . In winter, because the temperature is relatively low, it is a good way to exercise in winter, such as running or cycling, which can effectively enhance the physical fitness. In winter, fitness can effectively accelerate human metabolism and improve human physique. In winter, due to the cold temperature, the human body's resistance to diseases will gradually decline, and the immunity will also decline. In winter, exercise can prevent colds, increase the number of disease-resistant bodies in the blood and improve the elasticity of blood vessels.