I would think biking has a lot of impact on the knees, but if the doctor said it’s ok then you could definitely do swimming as well. It works great if you want to lose weight. In fact, it’s the only sport where every muscle on your body is put to work.
Also, you could do most exercises for abs, arms and back along with leg lifts in different positions.
Your situations doesn’t restrain you from exercising as much as you might think, as long as you avoid lifting heavy weights, running and jumping.
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