Swim at least 3 days a week for 30 to 45 minutes. Swimming is one of the best aerobic exercises you can do.
Ride a stationary or regular bicycle for 30 to 45 minutes at least 4 days a week. Use an elliptical machine.
Exercise your upper body. Lift weights, use fitness machines at the gym or resistance bands at home. You can strengthen your upper body and build muscle mass and burn fat, all without using your knees. Do at least five different exercises of 8 to 12 repetitions.
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