If the purpose of exercise is health, it is best to exercise from 4 pm to 6 pm. This time is the best time for people's physical strength. If it is best to lose weight by training on an empty stomach in the morning, the weight loss effect will double at this time. There is nothing wrong with exercising at night, but people who are weak and sick should not exercise at night, because night is the worst time for people's physical strength, and exercise before going to bed is easy to get excited and affect sleep.