When the elderly exercise, they must pay attention to their health. They must protect their bodies and exercise when there is no problem. Most of the bones of the elderly will be loose, so be sure to eat more calcium-supplemented food and keep a good mood. In my opinion, the elderly should play Tai Ji Chuan more, or do some sports with little exercise. They must be big enough to avoid excessive strenuous exercise. In the process of fitness, they must ensure their own safety.