This method is suitable for all ages, the exercise effect is excellent, and does not delay work, life, the method is as follows: sitting affected knee straight, ankle dorsal extension, the opposite side of the lower limb weight on the affected ankle joint and completely rely on the affected side support (if you need to exercise the rear thigh muscles on the opposite side of the lower limb force down), such as the original strength is weak, depending on the situation adjustment, after reaching a certain strength, each time at least adhere to 10 minutes, 10 times a day above. And in the same way to carry out another lower limb exercise. 1, sitting leg extension (1) starting position: sitting on a special bench, on the other side of the roller plus the weight of the barbell piece, both feet hooked roller, calf and thigh into a 90-degree angle. (2) Action process: both legs contract the quadriceps muscles, straighten the knee joint, so that the calf straight up. Stand still for a second, hang down the calf, repeat and do it again. (3) Breathing method: Inhale when stirring hard and exhale when descending. 2.Leg lifts (1) Starting position: Lie on your back on the bottom of the “leg lifts”, curl your legs so that the entire sole of your foot is on top of the bottom of the weighted plate. (2) action process: both legs upward stirrups, to both legs completely straight, while trying to contract the quadriceps. Stand still for one second, bend your knees, and let the weighted plate slowly descend to the height of the first card. Repeat and do it again. (3) Breathing method: Inhale while stirring hard and exhale while descending. (4) Points to note: Lie on your back with your hips directly under the center of the weighted plate. When stirring the board, the entire sole of the foot should be flat against the bottom of the board.