Ck with your doctor but I too have arthritis in my knee - the right one is missing a lot of cartilage so cycling is what they had me do in physical therapy, along with limited elliptical training - forward only and no incline.
Swimming and water aerobics may be okay - there is a lot you can do in the water without overworking your knee. I do a lot of skulling - lying on my back and moving forward and back with just my arms. You can also swim using mostly your arms - back stroke, crawl, breaststroke (go very easy kicking out to the side) and learn the sidestroke - the scissors kick is sometimes the easiest because you don't need to bend the knee much at all.
Another exercise that works for me is to go to the park and sit on the swings. I get moving pretty well then primarily use my good leg to keep up the momentum, and shifting my body weight. It beats mowing the lawn but that too burns calories if you can do so comfortably and not causing pain.
Lots of seated exercises, lifting weights with the arms, crunches, bending over at the waist and twisting - remember old fashioned calisthenics? - combinations of stretches and movement. There are several yoga styles and some will give you a great workout without hurting yourself. Just modify or skip those poses. And don't forget the stretchy resistance bands.
You might want your doctor to refer you to a good PT office. Physical therapists can give you a home routine that will improve your body, balance your muscle groups, get you stronger and then keep you in better shape so you don't get reinjured.
| Pounds lost: 20.0