The objective of this study is to reproduce evidence to distinguish the different forms of exercises most applicable in clinical practice for aging adults who are suffering from osteoarthritis of the knee joint. Knee osteoarthritis is one of the most common degenerative diseases causing disability in an elderly individual. Osteoarthritis is an increasing problem for aging people. Among many treatment strategies, Exercise is recommended as a first-line conservative intervention approach for Osteoarthritis. A wide range of exercise programs are available and scientific evidence is necessary for advising patients with OA on the optimal treatment strategy. So, reviewing literature for this condition is noteworthy. A computerized literature search of MEDLINE, CINHAL, EBSCO, and PUBMED was carried out. Randomized clinical trials on exercise therapy for OA of the knee in geriatric populations were selected. Two authors individually selected the studies and a third author was referred for an additional opinion. Conclusion: There is evidence of the beneficial effects of exercise therapy in patients suffering from OA of the knee. However, the lesser number of good studies limits drawing firm conclusions.