There are many benefits of long-term running, it will make the body’s various muscle tissues more will consume excess body fat, will exercise the heart and lung function, increase lung capacity, and then there is to make the digestive function and nine systems of physiological function, will be in a better state. It will speed up the metabolism, promote bone growth, increase bone density, promote sleep, there are many benefits. But there is also a part of the bad side, the bad side is mainly the wear and tear on the knee joint, because the human body in the case of the half squat, the pressure on the knee joint is very large, in the running time single leg support, so the whole body weight will be concentrated on a single leg, and then back and forth cross, so the knee joint and meniscus will have friction, this friction 1-2 days to see what. But if it is 1-2 years of long-term running, the friction on the meniscus is irreversible. The pain is not felt because there are no blood vessels or nerves in the articular cartilage or meniscus. It is possible that in the case of abnormalities in the problematic walking gait, the problem is already serious. In the case of severe meniscus wear, the elderly will choose to replace the joint, knee replacement or meniscus replacement or surgery, this situation is very common, so the bad side of running is the wear and tear on the knee joint.