A person's stomach is full of stomach, intestine, liver, gallbladder and other internal organs. They are not hanging in the air, but are all wrapped in some films. These films are finally gathered and tied to the spine like belts, so that people will not disturb them when they are rolling. But when they run, they fall down together, and when they shake their bodies, they all shake and move. It is inevitable to pull the film wrapped around them and the tape tied to them, so that the film and the tape are stimulated. In this way, they run fast for a long time, the membrane and strap are greatly affected and stimulated, and their stomachs will hurt. Especially for people who usually lack exercise, the muscles in their stomachs are very loose and their internal organs shake badly when running. Abdominal pain is more likely. People who often take part in physical exercise have strong abdominal muscles and seldom have stomachache. After a full meal, the gastrointestinal tract is full. At this time, if you run, the gastrointestinal tract will swing more violently, and you will be stimulated more, not only with stomachache, but also with vomiting.

Breathing with your mouth open while running is actually adding fuel to the fire. As we all know, there is a diaphragm between the chest and abdomen. The diaphragm is above the lung and below the viscera such as liver, spleen, stomach and intestine. When breathing, the diaphragm should move up and down to push the internal organs. Breathing with the mouth open, the amount of air intake is large, and the diaphragm pressure is very heavy, which has a great impetus to the internal organs. The internal organs are shaking because of the influence of running. The impact is even greater. In this way, every time you take a breath, the diaphragm will be pressed down, and when you run, you will gasp. When the diaphragm is pushed again and again, the internal organs will be strongly affected, and the stomach will naturally be more painful. Therefore, when an experienced person is running, he will always take a leisurely breath through his nose and take a deep breath slowly, so that the diaphragm will not have a strong push on the internal organs and his stomach will not hurt easily.

In addition, the posture of running is also very important. Toe landing is elastic, visceral vibration is small, and the stomach is not easy to be injured; The heel is not elastic, and the internal organs vibrate greatly, which is easy to hurt the stomach. Heel is not only easy to hurt the stomach, but also often hurts the brain!