The training of professional athletes is usually arranged in the afternoon, because the afternoon is the best time for human hormones, strength and various reactions. For ordinary people, the difference in the influence of time on physical strength can be ignored and does not need special consideration. Choose the timing of exercise according to your own time and diet. It is best to exercise for an hour and a half after meals, at least one hour.

Exercise is good for sleep, but doing exercise before going to bed will reduce the quality of sleep. When approaching sleep, you should avoid strenuous exercise, sweat a lot, and be excited before going to bed. Excessive body temperature will reduce the quality of sleep. Before going to bed, you can relax your muscles through massage and yoga, and do some stretching and relaxation exercises to promote sleep.

Many people have the habit of doing morning exercises. In terms of time, morning exercises generally do not affect normal work and study, but can promote people to change from sleep state to awake state more quickly, improve the functions of various organs and systems in the whole body, and prepare for work and study in a day. However, morning exercise is not suitable for everyone, nor is it perfect.

At about 6 o'clock in the morning, the body's blood pressure began to rise, and the heart rate gradually accelerated, reaching a peak at about 10 in the morning. If patients with coronary heart disease and hypertension exercise during this period, especially when engaged in strenuous activities, cardiovascular and cerebrovascular accidents are prone to occur. At 6 ~ 8 in the morning, the cohesion of platelets is obviously enhanced, at this time, the blood is thicker, and exercise during this time period will also increase the probability of cardiovascular and cerebrovascular infarction.

I slept all night and didn't replenish water in time in the morning. At this time, the body is in a state of relative water shortage, the circulating blood volume in the body is relatively insufficient, and the blood viscosity is high. For the average person, exercise at this time will affect the blood flow velocity of the whole body and cannot meet the oxygen demand of the body during exercise; For people with some physical diseases, it is easy to induce myocardial infarction if they suddenly change from static state to exercise state.

From the environmental point of view, many people like to exercise before dawn. At this time, atmospheric activities are relatively static, and various industrial and domestic waste gases are not easy to dissipate. At this time, the air pollution is serious, which is not conducive to exercise. The best time for exercise is from 10 to 12 every morning and from 3 pm to 7 pm. In addition, reasonable arrangements should be made in combination with many factors such as season, environment and weather to avoid the above unfavorable factors. This is a scientific exercise time.