The squat is an important and convenient way to rehabilitate knee injuries. It is convenient because it can be practiced whenever there is a wall, it is not limited by space or time, it does not require rehabilitation equipment, and the angle and duration of the squat can be controlled according to your ability. Another advantage of squatting is that it does not increase joint damage, because it is a stationary exercise, so it does not increase joint damage, and generally does not cause pain and is easy to adhere to. The squat is not only a cure, but also a very good exercise method for those who don’t usually exercise much to improve their muscle strength and ability. The squat is especially effective for the following conditions: chondromalacia patellae, patellofemoral cartilage injury, osteoarthritis of the knee, patients with weak squatting power or prone to pain, people who rarely exercise and want to strengthen their thigh muscles, patients with joint injuries (such as meniscal injury, anterior and posterior cruciate ligament injury, patellar dislocation, etc.) in the early to mid-term recovery period. Exercise site requirements: a strong / solid / clean wall, the ground requires dry, non-slippery, to avoid slipping. Exercise essentials: back against the wall, chest up, feet apart and shoulder width, toes forward, feet do not rotate inward or outward, heel distance from the wall according to height and muscle strength and different, generally 25cm-40cm, taller, can be far from the wall, muscle strength is weak from the wall to be closer. The back must not leave the wall. Begin squatting with both knees bent. Both knees bend at different angles according to the patient’s physical condition and muscle strength, according to the strength, gradually, generally do not exceed 90 °, because squatting too deep, will significantly increase the pressure on the patellofemoral joint, but does not produce a strong exercise effect on thigh muscle strength. The knee should not go beyond the toes, parallel to the toes. Exercise time and number of times: the time of each static squat varies greatly from person to person, each squat to the end of an inability to adhere to, rest 1-2 minutes, and then repeat into, 30 minutes for the day of a group of static squat exercises, repeat 3-6 groups per day for the best. Squatting is best done at an angle that does not cause significant pain. If you feel very strained or painful static squatting exercises, you need to reduce the angle of squatting and the duration of one time, otherwise improper practice will aggravate the injury. A: The standard position of the static squat with a relatively small angle. B: the angle is relatively large static squat, regardless of squat high squat low keep the knees and toes in a vertical line, the knees do not exceed the toes.