The body is like a machine at work; only through continuous operation can a machine become more and more agile. The same is true for humans; only through regular exercise can the body's various functions avoid premature aging. Therefore, life lies in movement. For the sake of health, many people get up early every day to run and do various fitness activities. But is exercising in the morning always the best? Is it always beneficial to the body?

　　There's an old saying, "The early bird catches the worm," so many hardworking people get up early to exercise in order to have a healthy body. However, with the development and progress of society, we now emphasize scientific exercise. So, from a scientific perspective, when is the best time to exercise?

　　Studies have found that high-intensity exercise can be performed two hours after a meal; moderate-intensity exercise should be performed one hour after a meal; and light-intensity exercise is most suitable half an hour after a meal. Based on this, several optimal exercise times can be deduced:

　　Morning period: From waking up to before breakfast (5:00 AM to 6:00 AM)

　　Morning period: 2 hours after breakfast until lunch (9:00-10:00)

　　Afternoon period: 2 hours after lunch to before dinner (2 pm to 5 pm)

　　Evening period: 2 hours after dinner until bedtime (7 pm to 9 pm)

　　Each of these time periods has its advantages and disadvantages. For example, in the morning: vigorous exercise can stimulate the sympathetic nervous system, and this rapid change can cause a series of changes in the body, affecting mental state throughout the day and potentially harming health. Additionally, blood sugar levels are low during this time, and exercise can deplete blood sugar, easily leading to hypoglycemia. Exercising in the morning or afternoon is further influenced by objective factors such as work, commuting, and household chores.

　　Modern exercise physiology research shows that the peak and trough of human physical strength are controlled by the body's "biological clock," generally reaching their peak in the evening. For example, the lowest point of oxygen absorption by the body is around 6 pm; heart rate and blood pressure regulation are most balanced between 5 pm and 6 pm; and the body's senses of smell, touch, and vision are most sensitive between 5 pm and 7 pm. Therefore, overall, exercising in the evening is more effective.

　　Furthermore, the activity of hormones in the human body is at its peak between 4 PM and 7 PM, and the body's adaptability and nerve sensitivity are also at their best. Therefore, experts advocate exercising in the evening, but it's important to pay attention to the intensity of exercise during this time; otherwise, excessive intensity can excite the sympathetic nervous system and hinder sleep.

　　Therefore, in general, 3 pm to 5 pm is the best time for exercise.