It is not good to exercise in the morning. Because after a night of consumption, just getting up is the time when blood sugar is the lowest in a day. Exercise immediately at this time, which will easily lead to hypoglycemia. In addition, the air is humid in the morning, with more carbon dioxide and less oxygen, and the air is dirty. At this time, exercise is not good for the respiratory system and is prone to respiratory diseases. Moisture can also take advantage of it and may suffer from rheumatism. It's best to drink a glass of milk or honey water in the morning and exercise after 30 minutes, which can provide enough energy for exercise. It is best to do exercise 30 minutes after the sun comes out, because the moisture has basically dissipated and the air is fresh.