Be sure to eat something before exercise. The key is the time interval, so that you can have enough energy consumption during exercise. The time interval should be at least 30-45 minutes. It's after 9 o'clock in the evening after exercise, depending on whether you have eaten before. You can eat at around 6 o'clock and then go to exercise. If you are hungry, it will do you more harm. The purpose of fitness is health, and health is a scientific and reasonable system. It's right not to eat when it's late.