Strengthening exercises include isometric exercises (pushing or pulling against static resistance). - knee OA. Strengthening quadriceps muscles. Isometric training builds muscle strength while burning fat, helps maintain bone density, and improves digestion. For patients with arthritis in the hip or knees, exercises that strengthen the muscles of the upper leg are important. Exercise, such as weightlifting, helps build muscle that is usually lost with age and puts stress on bones, helping keep them strong and healthy.



References:
http://umm.edu/health/medical/reports/articles/osteoarthritis