Knees take a pounding even before an arrow happens to find them. Because the knee is a hinge type synovial joint it presents a level of complexity not seen in other joints. Conditioning of the surrounding muscles is crucial in achieving joint stability and preventing injury. If you have been unlucky enough to have been injured here, the exercises will help add to the speed of rehabilitation of the knee joint (as long as you are not at one of the stages of injury that require operational intervention). The exercises here are designed to help maintain the range of motion a healthy knee joint is capable of. They can also work as preventative measures, taken to avoid sustaining knee injuries.