Knee injuries are usually the result of prolonged weight bearing on the knee joint, leading to degenerative disease of the joint. Acute injury to the joint can be caused by any acute injury after strenuous exercise. To avoid not damaging the knee joint, it is necessary to do exercises that are not weight-bearing, the knee joint will not be stressed, and joint damage will be minimal. 1, flat road walking. You can walk and jump on flat land, you can do warm-up exercises before walking, half squatting to move the knee, when walking, pay attention to light lifting and gently put, to avoid causing damage to the knee joint, it is best not to walk fast or walk on top of the treadmill, the damage caused to the knee joint is great. 2, swimming. If you can’t swim, walking in the water is also a good way to exercise. 3, cycling. Bicycling not only does not cause weight on the knee joint, but is also conducive to the recovery and maintenance of knee function. 4, practice yoga. In doing yoga do not do too difficult movements, otherwise it will increase the burden on the knee, do more half squat and squatting movements, is conducive to strong knees. It should be noted that everything has a degree, can not do too much, a day to do one or two hours can achieve the exercise effect.