Long time squatting itself on the knee joint damage is very, if in the process of doing this action or to practice for the purpose, then the possibility of damage to the knee is even greater. Because in this process, the knee joint surface contact is very large, and friction is very large, while the muscles and ligaments around the knee joint in a very tense situation, it is easy to appear around the joint muscle ligament strain, strain injury, and serious meniscal tears. These are inadvertent movements, the elderly themselves have osteophytes, osteoarthritis, after doing this training is easy to joint pain, leading to aggravation of the underlying disease, before the knee joint inside the tissue damage, after doing these exercises is more likely to appear new injuries. So do this functional training must grasp the time, grasp the amount of training, do not do it blindly.