According to the principle of biological clock regulation, the adaptability and physical exertion of the body are best in the afternoon and near the evening (about 4 to 6 o'clock). At this time, most people are calm and stable, full of physical strength, and the flexibility, coordination, accuracy and adaptability of technical activities are in the best state, so this time period is a very good choice.

According to a research report published by the Clinical Research Center of the University of Chicago on the 20th, the human biological clock plays a more important role in the body's response to exercise than previously thought. This result may change people's habit of exercising in the morning.

The research center studied the body's (hormone level) response to exercise in 40 men aged 30 to 40 at different times of the day. The results show that hormones, the key substances of human metabolism, have the strongest response to physical exercise at night and at night.

Researchers at the University of Chicago said: "At night or at night, corticosteroids related to fat metabolism and thyrotropin related to muscle repair rise sharply."

For example, the researchers said that the blood test results after an hour of high-intensity exercise on the treadmill in the morning showed that the hormone level was comparable to that when staying in bed at the same time. After the same exercise from 7 pm to 2 am the next day, the hormone level is much higher than other time periods. This shows that the response of hormones in human body to exercise at different time periods is controlled by biological clock or circadian rhythm.

Morning, noon and evening are the best time for running. In recent years, scientists have been exploring the relationship between biological clock and exercise, in order to find a time that can consume the most fat every day. The results show that the change of body temperature will affect the quality and effect of exercise to the greatest extent. In other words, when exercising, the higher the body temperature, the better the exercise effect.

Usually the body temperature is the lowest within 1~3 hours before getting up, and it will rise to the highest in the afternoon. Therefore, it is safe to say that the best time for exercise is in the afternoon. During this time, your muscles are warm, your physical strength is abundant, your heart rate is stable and your blood pressure is low.