I did all the pre-op exercises religiously for one month before the surgery. Except for the arm strengthening exercises on my list, which were noticeably helpful, I didn't find them of any use in my post op recovery. I also did regular pool therapy for months and months but, again, I'm not sure any of it transferred to my post op recovery, which for me, has been difficult. Would it have been even harder without them? Maybe, but it's hard to really see. Now, I only found the Bone Smart site after 3months, so my recovery was based on the PT no pain, no gain, do it or else method! Which resulted in swelling, pain, misery. I'd say probably that pre op exercise is probably a good idea for feeling good.