Therapeutic exercise takes a multitude of forms and results in numerous systemic and local effects, some of which have been investigate among people with knee osteoarthritis. Therapeutic exercise covers a range of targeted physical activities that directly aim to improve muscle strength, neuromotor control, joint range of motion and aerobic fitness. One of the main aims of this therapeutic approach is to improve muscle strength, given that weakness is common in knee osteoarthritis. Enhanced strength of the lower limb may lessen internal knee forces, reduce pain and improve physical function.