2. It is best to choose morning for outdoor sports. You need to do warm-up activities before exercise, and don't do strenuous exercise immediately. Warm-up can show the body first, promote blood circulation to adapt to the intensity of strenuous activity, and then open the joints;
3. Choose the exercise that suits you, don't force yourself to do impossible projects, tailor your clothes to meet your own needs. For example, middle-aged people can do long-distance running and single parallel bars, while the elderly can do Tai Ji Chuan and aerobics.