Exercise is harmless, but for most people, after 9 o'clock, they are usually in a state of excitement and it is difficult to fall asleep.

Going to bed too late will be bad for the five internal organs of the human body, and it is difficult to fall asleep in an excited state. The period from 1 1 to 2: 00 am is the state of human sleep and the best time for human sleep. Going to bed too late will easily affect your mental state and your study the next day.

9 pm to 10 pm is not suitable for exercise. It's time for your body to rest. Strengthening physical fitness requires daily exercise. The best time is before dark in the afternoon. When the air is good, the human body also needs exercise. It is also ok to exercise in the morning, and it is best to wear a mask. Now the air pollution is serious, inhaling too much dust will cause lung diseases.