You've gotten some positive responses, and I can only add "ditto" "ditto" to the other comments. Especially swimming and gentle yoga (make sure the teacher is well qualified to instruct you in modified positions), Pilates, or anything that will strengthen the "core". A strong core seems to prevent a lot of what we can do to ourselves. One other activitity I would add is walking (with appropriate shoes). Also, important that a bike fit you properly. It might take time and effort (especially because pain/discomfort makes us not want to move), working with a physical therapist -- whatever it takes. Might take some time -- don't become discouraged...I just know you will do what it takes to end up with a stronger, healthier body.