You shouldn't run too early in the morning, for example, between 5 and 7 o'clock. At this time, the outdoor air contains a lot of carbon dioxide discharged by plants at night, which is not conducive to the exchange of oxygen in the lungs and blood. And if it is too early and the temperature is too low, it is not conducive to the enhancement of body muscle activity. You should do enough warm-up exercises in the morning. If it is too early, it will not make the viscous blood more viscous when running and sweating, leading to thrombosis. Therefore, the air quality in morning running is good, and there is no smog. After 7 o'clock, drinking warm water (diluting blood) and doing sufficient warm-up can promote the excitement of cortical neurons, make the body quickly enter the working state, and also exercise body building and fat reduction, and exercise people's endurance and willpower.

Running as a means of physical exercise, people generally choose to get up and run in the morning. Scientific research shows that running at night is good for health. Morning running increases the thrombosis of blood vessels, which easily leads to vascular embolism, so the blood cohesion increases by 6%, while fun run reduces the number of platelets by 20%, greatly reducing the risk of vascular embolism.

In addition, the blood pressure, heart rate and acceleration are high during morning running, which is easy to cause overload and affect exercise efficiency and health. At night, the sensitivity and adaptability of physical strength and limb reaction reach the peak, and the steady or low heartbeat frequency leads to the acceleration of heartbeat and the slow rise of blood pressure, which is beneficial to health.

Running at night can also promote better sleep. As long as you master the intensity of exercise, running at night will make people sleep better. Slight fatigue is just rest. Sports medicine has proved that it is more dangerous for people with weak cardiovascular function to exercise when their organs are still at a low level when they get up in the morning, and it is easier for the running body to adapt to the rhythm of exercise when the human activity ability is fully developed at night.