Getting yourself in shape is a great idea and doing the kegels. You'll want to get yourself things to keep occupied while you recover. I thought I would read a lot but found I was too restless to concentrate on books (I'm not very good at lying around doing nothing). I watched the Mad Men series which I had never seen before, that was great - one episode every night. I actually played my kids PS3 game quite a bit, I found it a good mindless way to pass the time.
My wife got me a small plastic basket with a handle in the middle so I could keep my supplies organized and and easily carry them around. That was helpful.
I needed to drop 10 pounds and I did that and more after surgery. I was very careful about what I ate while recovering (with my wifes help ) and at the end of the 3 months when I was allowed to be physically active again I was at my ideal weight. Unfortunately when I became active again my appetite shot up and I quickly put the weight back on. I should have been more careful because I'm now finding it difficult to get it back off.
Follow your doctor's advice and don't rush back into doing physical activity, the last thing you want after this is a hernia after all this. I play hockey a couple of times a week and I was very concerned about that so I took my time and eased back into it. It's very hard to get into the mindset of being a patient and allowing others to do things for you.
PSA 5.43 at June 2010 physical
Biopsy: 8 of 12 samples positive, 75% in 1 core. Gleason 7
Radical Prostatectomy 12/3/2010
DIC complications during surgery (17 units blood/plasma)
Pathology: 3.5cm tumour, no capsular invasion, lymph nodes negative
Catheter removed 12/26/2011
PSA currently undetectable!