The reason for this is the following：

1, because when you get up in the morning, the human body is usually in a state of hypoglycemia because of fasting all night.

2, after the blood sugar is low, the human body has no strength to exercise, and it is definitely easy to get hurt when exercising.

3. If it is hypoglycemia exercise, you will consume more protein, because training belongs to anaerobic exercise. The only energy-supplying substances for anaerobic exercise are sugar and protein, and fat can only be decomposed when there is enough oxygen, so exercise on an empty stomach in the morning consumes muscles.

Based on the above factors, exercise after breakfast is better.

1, the body will quickly replenish sugar after breakfast.

2. When the sugar is sufficient, it can improve the training intensity and achieve good training results.

3. Enough sugar can preserve protein, that is, protect protein from decomposition.