The squat has a wide range of applications, including patients after knee surgery; patients after thigh muscle injury; patients with osteoarthritis of the knee; patients with patellar chondromalacia and patellofemoral joint cartilage injury; patients with conservative treatment of knee injuries; patients with other chronic knee pain; weak lower limb strength, usually very little exercise need to strengthen the thigh muscle strength of the population. The most important training is the quadriceps, other lower limbs and lumbar abdominal muscles including N rope muscle, calf triceps, gluteus, iliopsoas muscle will also play a role in supporting the coordination. These muscles trained in the squat are important for preventing knee injuries and reducing the risk of falls. Usually the standard posture of the squat is: the upper body remains upright, head up and look straight ahead, according to their ability to hands can be lightly on the legs or hanging on both sides of the body or flat lift, side lift or to do ball-like placed in front of the chest can be, the pelvis can be slightly forward leaning, feet apart and shoulder width, toes and knees are facing the front, and keep the knees and toes in a straight line, and does not recommend knees over the toes, between the thighs and calves The angle between the thighs and calves is adjusted depending on the specific situation, generally this angle is maintained at 90 degrees or more, the angle is too small quadriceps exercise but not sufficient. Each time the squatting time to feel their own exhaustion can not continue to adhere to the degree, each squatting force after an interval of 1 to 2 minutes after the start of the next squatting, to 3 to 5 times as a group, each day can be practiced in different time periods 3 to 5 groups. The following are some of the different squatting methods for different groups of people: post knee surgery patients Squatting against the wall is ideal for some rehabilitation training after knee surgery, so that the patient’s back against the wall, can reduce the force of the posterior thigh N rope muscle group and the muscles around the hip joint, more concentrated stimulation of the quadriceps muscle strength growth, and easy to regulate the load on the knee joint, more conducive to the rehabilitation of the knee joint after surgery. Patients with chondromalacia patella may experience pain in the knee joint when doing static squats, but generally even chondromalacia patella does not cause pain at all squatting angles, so for patients with chondromalacia patella, you can start squatting down slowly from an extended position, find the angle that causes pain and then squat up a little to maintain the static squat. Some patients have significant muscle atrophy on one side of the lower limb, while the muscles on the healthy side are relatively good, and the imbalance between the muscles of the two legs is more serious, so you can use the assistance of an elastic band to increase the load on the affected leg. For patients who are more capable, or who have higher rehabilitation requirements, the patient can also be asked to perform single-leg static squats to further strengthen the affected leg. Patients with poor flexibility Some patients will feel a strong pull on the Achilles tendon and calf when squatting at a relatively large angle. These patients have poor flexibility and can usually strengthen the flexibility of their legs. When squatting, you can put a small wooden block at the heel to reduce the degree of pulling on the Achilles tendon and thus reduce the discomfort in the legs. In addition to the above some of the more basic squatting methods, with some other fitness equipment there are many advanced training methods of squatting: a, holding the ball squat. b, back against the ball squat. c, balance mat, BOSU ball on the squat. d, vibration training machine on the squat.