Fasting can be moderate exercise, but does not recommend strenuous exercise. Fasting state can do some moderate exercise, such as walking, jogging, etc., according to their own age and physical fitness to choose the appropriate mode of exercise. But fasting is not recommended to do strenuous exercise, because it is easy to lead to low blood sugar, may cause fainting. Before exercising, you should eat some easily digestible food with high energy, and then rest for about an hour to digest the food as much as possible before exercising. At this time, the blood glucose concentration in the body is higher and the energy is more abundant, which is suitable for exercise. If dizziness occurs during exercise on an empty stomach, you should stop exercising in time, and it is recommended that you go to the hospital for treatment of severe dizziness.