Have you considered swimming? If you have the facilities available, it is really easy on the joints and a serious full body work out. Just make sure that you read up on form so that you work your body well without getting exhausted too fast. My boyfriend swims daily because he hates the pressure on his joints from running (I run and try to get him to come with me). I have gone swimming a few times with him and it is intense on both sides (cardio/strength).

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