Sports medicine has proved that when you get up in the morning, the operation of human organs is still at a low level. At this time, exercise is more dangerous for people with weak cardiovascular function. However, the activity ability of the human body is fully developed at night, and it is easier for the body to adapt to the rhythm of exercise when running.
From the external environment, the latest research shows that the carbon dioxide index in the air is the highest in the morning, and the dust suspended in the air the day before has not completely disappeared. At this time, exercise is far less good than the environment at night.
If you can't run well on an empty stomach in the morning, you are prone to hypoglycemia. It is best to drink a glass of cold water or salt water before running. If you are not used to it, you can drink warm water, which is beneficial to replenish water in your body. After running, I usually eat in half an hour.