Brisk walking can lead to severe wear and tear of the cartilage on the surface of the knee joint, and over time, the damage becomes more obvious. Fast walking every day will usually have knee pain, limited activity, joint flexion and extension activities will also have intra-articular friction sound, and even muscle atrophy can occur secondary to the body is extremely unfavorable. Daily should be slow walking exercise joints, while strengthening muscle strength, only after muscle strength fully recovered, then you can gradually increase walking speed. Fast walking can produce damage to the joints, and will not make the joints and muscles to get full exercise, rather than the use of resistance training, such as elastic bands or sandbags, weight bearing knee flexion and extension activities, the effect is better, and usually does not produce serious damage to the joints.