Exercise in autumn to prevent sudden colds in cold weather. Because the temperature is low in the early morning of autumn, clothes should be increased or decreased according to the outdoor temperature change. It is not advisable to take off too much at a time when exercising. You should wait until your body gets hot before taking off your coat. Especially when the elderly go out to exercise, they should pay more attention to the temperature difference between morning and evening to avoid catching a cold. The secondary prevention exercise of autumn health care is very heavy, which leads to the damage of physiological joints. Because human muscle ligaments will reflexively cause vasoconstriction, the degree of muscle extension is obviously reduced, the physiological activities of joints are reduced, and the ability of nervous system to adjust motor organs is reduced, which is very easy to cause sports injuries of muscles, tendons, ligaments and joints. Therefore, we must pay attention to making full preparations before each exercise. In autumn, there are too many exercises for health preservation and three defenses, which cause oxygen damage. Autumn is a good time to exercise, but at this time, because the human body is in the stage of convergence and internal support, exercise should also conform to this principle, that is, the amount of exercise should not be too large to prevent excessive sweating and loss of yang.