2. Exercise is very effective in promoting health and enhancing physical resistance. When exercising, there are some precautions. It is best not to do strenuous activities half an hour before meals and one hour after meals. After the exercise, you'd better have a rest before drinking water or eating. Moreover, it is necessary to wipe sweat and put on clothes in time after exercise, which helps to prevent colds.
When going out for leisure and entertainment, we should pay attention to prevent the emergence of some infectious diseases, especially respiratory diseases. In the winter or spring when the flu is frequent, you should go to public places of entertainment less or even not.