It can be painful at times.
Aerobic exercise is often a part of therapy for reducing the effects of arthritis.
One of the primary benefits is that it helps maintain ideal body weight and joint range of motion. The key is to find the exercise activities appropriate for your condition. You mention that you have an arthritic knee. The condition may be aggravated by high-impact activities such as running , but may respond favorably to the lower impact of cycling. Better still may be non-weightbearing activities such as swimming , water aerobics, or an arm ergometer .