Exercises that are less harmful to the knee joint, including swimming and elliptical exercise, are as follows: First, swimming, the human body will be buoyant in the water, so the knee joint will not bear almost any weight. And in the water can also fight resistance, exercise the muscles of the whole body, including the main muscle groups of the lower limbs, is conducive to the knee joint stability enhancement. In swimming to combat low temperature, human blood circulation will also accelerate. Long-term adherence to swimming is conducive to blood supply to the body surface, can reduce the knee joint by the cold attack, and prevent synovitis of the knee joint. Second, elliptical exercise, elliptical exercise can consume a lot of body fat, reduce weight, weight loss can ease the wear and tear of the knee joint, to protect the knee joint. The range of knee flexion and extension activities during exercise is also relatively small, so elliptical exercise on the knee joint wear and tear is also relatively light.