The quadriceps muscle is composed of the rectus femoris, medial femoris, lateral femoris, and middle femoris muscles, and the tendons of these four muscles converge to form the quadriceps tendon, which is connected to the patellar tendon by the patella. The quadriceps training is essential for the prevention, treatment, and postoperative rehabilitation of knee disorders. The following is an introduction to the training methods of the quadriceps muscle. 1, from the muscle strength training has the following four steps 1, quadriceps contraction under non-weight-bearing straight leg raise training: knee as straight as possible, thigh front quadriceps contraction, ankle as dorsal extension, slowly lift the entire lower limb about 15CM, hold for 5 seconds, and then maintain the same position, slowly straight leg down. 2, weighted straight leg raise training generally use 2KG sandbag to start, fix the sandbag on the ankle joint, repeat the action of step 1. Step 1 and 2 exercise method we call the quadriceps isometric contraction training. 3.Isometric contraction of quadriceps in bed Lie on your back, bend both knees together at 90 degrees, keep the healthy knee flexed at 90 degrees, keep the affected knee thigh level with the healthy side, straighten the knee quickly for 5 seconds, and lower it slowly. 4.Bedside quadriceps isotonic contraction training Sit on the edge of the bed, both lower legs hang naturally, both lower legs straighten, and slowly fall. Second, quadriceps isotonic strength training generally requires special resistance contraction apparatus, but one of the simple methods of operation in the family is to bend the knees at the bedside, feet stirring the head of the bed, straighten both knees, the body moved back, the second method is to place a homemade spring device at the bedside (two boards between the spring), the feet compress the spring, and then slowly release the spring against resistance. Third, the training of quadriceps flexibility There are three simple and easy methods, one is in situ bicycle training, two is the bed pedal training, three in the fitness equipment, standing side-by-side rotating turntable, middle-aged and elderly knee joint due to wear and tear, resulting in osteoarthrosis. This disease is mostly manifested as knee pain when walking, sometimes accompanied by fluid swelling in the knee capsule, and recurrent episodes. Commonly used activity methods for young adults are practiced by middle-aged and elderly people, with many inconveniences. An exercise method for the middle-aged and elderly is introduced for reference only. The patient is sitting on a chair, with both feet on the ground, so that the affected side of the toe against a fixed object (such as a table leg, wall). Extend the knee with force and let the tip of the foot against the fixture. (Note: the heel should not be lifted.) Then relax, for once, repeatedly. Measure the control, the length of time should be measured. Again, it should be noted that each time you extend the knee, you must let the thigh muscles tense and then relax. If the operation is difficult, you can also sit on a chair, the affected foot to do repeated braking action, each time the activity, must let the thigh muscle a tension, a relaxation. This method not only exercises the muscles, but also helps to absorb the joint fluid without wearing out the joint.