First, after a meal, the blood sugar of the general human body is high. Within an hour after a meal, blood sugar has been maintained at a relatively stable level by the body's regulatory mechanism.
Secondly, I usually feel full after a meal. If you exercise directly, your abdomen will easily feel uncomfortable and even painful. Within an hour after a meal, the feeling of fullness will slowly slow down, and exercise will not cause unnecessary burden.
Third, the human body is lazy after meals. If you exercise at this time, your body may not reach the excited state, or you may enter the excited state slowly, which has an impact on exercise. It is suggested that you can slow down first, plug in headphones and listen to some dynamic music to improve your excitement.