1. When I first got up in the morning, all the organs of the human body were still in a cooling state, just like when the computer was just turned on. If I do it right away, it may cause jam or even crash. So you must be prepared for exercise when you run in the morning. Including warm-up preparation (if running in winter).

2. It is generally not appropriate to eat breakfast before running in the morning, because everyone knows the disadvantages of exercise after meals (bad for digestion and stomach). But running on an empty stomach in the morning is not good. You'd better drink some salt water or honey water. At least drink some water. Why do you drink water before morning exercise? Because after a night's sleep, the human body loses a lot of water due to breathing, urination and skin evaporation, resulting in insufficient blood volume, increased blood viscosity and stagnant microcirculation. In this state, participating in sports can easily induce cardiovascular and cerebrovascular diseases, especially those with hypertension and heart disease. Drinking water before morning exercise can change these unfavorable factors.

3. Although the air is fresh in the morning, trees need to breathe and consume oxygen at night. The photosynthesis in this whole process is zero, so the oxygen content in the morning is still relatively small, but at night, there are fewer vehicles in the city and the automobile exhaust is scarce, so I feel the air is fresh.