I would hope your consult for Gleason 6 recommends active surveillance ( no treatment for now, just keeping an eye on it) however, if you do choose surgery, keigel exercises are a must. I think too many men don't know about them until after surgery. Start them well ahead of surgery and after. Turns out I've been doing them my whole life and didn't even know it. Two years after surgery, I still do them daily. Concerning other exercises, I would work on getting in the best overall possible shape before surgery. Lose all the excess weight (if any ) that .you can. If you've got the big male gut, lose it! I've read very overweight men can't have robotic surgery. It helps the surgeon if the robotic arms don't have to operate through a lot of fat (so I've read.)