Generally every day moderate cycling will not cause too much damage to the knee joint, because cycling this movement belongs to the knee flexion and extension activities, generally not accompanied by twisting movements, for the knee joint is not very heavy, while in cycling the knee joint is not bearing the weight of the body, because people are sitting on the car, so this movement is limited damage to the knee joint. In addition, if cycling too fast, strenuous exercise, often use explosive force to ride, cycling sections often produce uphill, appear to stand up cycling, these can cause damage to the knee joint, so moderate cycling will not cause very serious damage to the knee joint, you can exercise every day.