Meditation itself will not harm any part of the body. However, in the process of meditation, there will be some special places that are sour, painful, numb and swollen after sitting for a long time. For example, ankle, knee, ischium and lumbar protrusion. These are all natural phenomena. Don't worry. As long as you persist in meditation for a long time, these phenomena will gradually disappear. When meditating, try to relax the whole body and prevent muscle stiffness. At the beginning, whether it is single or double, the left and right legs should be exchanged frequently to prevent deformation.