The static squat, a method of exercise that we have concluded in our clinical work and which is suitable for the general population, especially the elderly, is mainly to exercise the muscle strength of the quadriceps. It is reasonable and easy to adhere to because it uses a static exercise method, so it does not increase joint damage and generally does not cause pain. In addition, this way can be exercised anywhere and does not require auxiliary equipment, so it is very feasible. Not only can it cure the disease, but it is also a very good exercise method for those who usually do not exercise much to improve their muscle strength and ability. Applicable conditions: patellar tenderness, patellofemoral cartilage injury, knee osteoarthritis (especially patients with poor squatting ability), painful lesions on the upper and lower poles of the patella, squatting power is weak or easy to pain patients, people who usually exercise little want to strengthen the thigh muscle strength, joint injury in the early to mid-term recovery period patients, etc. Specific exercises: 1, the main points of action: back against the wall, feet apart, and shoulder width, and gradually reach forward, and the body’s center of gravity between the formation of a certain distance, about 40-50 centimeters. At this point, the body has been presented with a squatting posture, so that the long axis of the lower leg and the ground vertical. The angle between the thigh and calf should not be less than 90 degrees. Because the squat is too deep, it will significantly increase the pressure on the patellofemoral joint, but also does not produce a strong exercise effect on thigh muscle strength. 2, the number of times and time requirements: generally each squat to the end of an inability to adhere to, rest 1-2 minutes, and then repeat. Repeat 3-6 times a day for the best. 3, special attention: the angle of the squat is very delicate, because the maintenance of the posture of the muscles have a “spillover effect”, simply put, each part of the muscle only in a certain range of angles to maintain the role of posture. Therefore, it is best to do squats at different angles. For example, 30, 60, 90 degrees 3 angles, the effect will be better. Squatting is best done at an angle that does not cause significant pain. Otherwise, improper practice will aggravate the injury.