Is the better the morning exercise in summer, the better?

　　The earlier you do morning exercises in summer, the better

　　Many people like morning exercise. Morning exercise has certain benefits. They think that the earlier the morning exercise, the better. In fact, this statement is wrong.

　　Before sunrise, because there is no photosynthesis, there is not much fresh oxygen near green plants. On the contrary, a large amount of carbon dioxide accumulates, which is harmful to the human body. healthy Obviously bad. Summer morning exercises should not be done earlier than 6 o'clock.