2. The energy supply of human body mainly comes from food, but it also comes from the decomposition of fat or glycogen in the body.

3. After a night's consumption, the human body's energy is in a state of deficiency, and morning exercises need to consume more energy, but the morning is the lowest period of liver glycogen. If you do morning exercises on an empty stomach at this time, the energy needed for exercise will be decomposed by the fat mainly from the body, which will lead to a large increase of free fatty acids in human blood, thus affecting the heart and causing arrhythmia.

The best time to do morning exercises in summer and autumn is from 5: 30 to 6: 30, and from 6: 00 to 7: 00 in winter and spring. The effect of doing morning exercises too early or too late will be greatly reduced, especially for the elderly and children.

The best places for morning exercises are parks, residential areas and green spaces. These places are rich in green plants, full of foreign flavor, and the air is cleaner, which is good for your health.