2. It is not advisable to go out for exercise too early. The temperature is low and the humidity is high in spring morning. Due to the large temperature difference between indoor and outdoor, the human body suddenly gets cold and is easy to catch a cold. But in the afternoon and evening, a lot of oxygen is accumulated under the shade of flowers and trees. At this time, the air is relatively clean, so the exercise time can be 14:00-20:00. Choose places with fresh outdoor air for exercise, such as parks, hillsides, forests, rivers and other places to avoid air pollution.

3. It is not advisable to exercise suddenly and not to do unprepared exercise.

4. Pay attention to the intensity of exercise. Generally, it is reasonable for the exercise intensity to return to normal after one hour of exercise. Spring Festival travel rush should not sweat too much, just sweat. After the exercise, dry your sweat immediately and put on clean clothes to prevent you from catching cold.

Fog is not suitable for exercise, which will endanger human health.

6. Don't open your mouth and breathe.

Learn to breathe through the nose, and get into the habit of breathing through the nose during exercise, because the nose can filter the air, so that the trachea and lungs are not harmed by dust and germs.