For the training of the knee muscles can generally be trained through straight leg elevation training, quadriceps contraction training, as well as squatting, swimming, running and other ways of training. 1. Straight leg elevation training: specific operation can take the supine position, make the lower limbs straight, and then force upward to elevate the lower limbs, and lifted to a certain height after holding a period of time. 2. Quadriceps contraction training: Quadriceps static contraction training can be taken in the supine position, and then the lower limbs straighten and then force contraction of quadriceps, driving the muscle activity around the knee joint. 3. Static squatting: first of all, make both feet shoulder width apart, and then slowly squat from a standing position, so that the knee and hip joints are kept ninety degrees, and then adhere to a period of time. In addition to running, swimming and other ways to exercise the muscles near the knee joint, specifically in the rehabilitation therapist under the guidance of the exercise, if the exercise triggered by discomfort, should be stopped in time and consult a doctor.