Frequent running may be damaging to the knees. In the process of running, it is easy to cause the cartilage and meniscus in the knee joint to be excessively squeezed and rubbed, resulting in damage, breakage or even detachment of the cartilage meniscus, which will lead to premature degeneration of the knee joint, formation of osteomalacia and knee joint pain, limited activities and other conditions. Therefore, for people who often run, it is necessary to warm up before running, so that the knee joint can gradually adapt to reduce knee injuries. After running, it is necessary to do relaxation movements to gradually eliminate the edema caused by the ligaments, joint capsule, cartilage and meniscus under the stress, so as to prevent excessive degeneration of the knee joint and the formation of osteoarthritis. Suitable exercises can be performed under the guidance of professional doctors according to your own situation.