Running doesn't mean running. Many people lack running because of lack of exercise, and the running posture is very unreasonable. Muscle strength is too weak to ensure that the joints move at a safe angle. The most typical is that the knee joint can not guarantee the motion in the sagittal plane. People with posture problems such as knee joint deformation and internal buckle can easily damage their joints after running for a long time. .
However, if a person has no physical problems and learns the standard running posture, then the long-distance running will definitely enter a state of fatigue, and the control ability will be weakened and uncontrollable. This does not guarantee a standard running posture. You can take part in the marathon and see who will run away in the end.
Importantly, joint injury is irreversible. Because some tissues in the joints don't supply blood. Muscle can heal because it has sufficient blood supply, nutrient supply and waste discharge, so it has the function of repair. After your joint is damaged, it can't be solved at all
Excessive exercise makes the blood supply and oxygen supply of various organs in the body unbalanced, which brings excessive pressure to the heart and metabolic system. This is * * * physiological knowledge. Marathon, an extreme sport, is against human nature. Ordinary people without systematic training want to be challengers. Even short-term injuries are almost inevitable.