In fact, every muscle contraction during exercise can promote blood flow from the whole body to the heart. If the movement stops suddenly, this blood reflux will also stop suddenly.
However, the pumping of heart blood has a certain lag. During this period, when it doesn't adapt to the end of exercise and continues to pump a lot of blood, people will feel dizzy and sick without enough blood reflux support. This period is just after exercise, and many people "get bigger when they sit down."
People's body shape, the size of pelvis and the width and narrowness of buttocks are determined by genes, diet and exercise conditions, and have nothing to do with sitting after exercise. There is no evidence that rest and relaxation after exercise are related to muscle growth. It is impossible to gain weight locally in partial weight loss.
After exercise, it is recommended to relax like this.
Although there is no harm in sitting down immediately, it is still suggested that after strenuous exercise, if the body can bear it, you can exercise a little for a while with less exercise intensity.
Doing so can gradually reduce the blood reflux, instead of stopping abruptly, and people will not feel so uncomfortable.
For example, after finishing the 800-meter sprint, walking slowly for a few minutes on the track, or doing stretching exercises (such as lunge or side squat) are all good choices.