I would suggest doing as much walking as you can without aggravating your back. I believe your fitness level will help you recover quicker. I would ask your GP for advice.
I did a lot of walking, working out, diet changes after my dx leading up to my surgery. I was pretty fit when I went under. I think it helped my recovery. I had good muscle tone and cardio fitness...not at an athletic level, but good for me and my age.
I was up and back and forth between my bed and chair in my hospital room within a few hours of waking up. I was walking the room and hallways shortly after.
-Nov/Dec 07, March 08 and Dec 08: Severe perineum pain . Septra/Bactrim for 8 months for diagnosed prostatitis.
-PSA start of 2008: 5.3..... PSA June of 2008: 7.3
-14 DRE all benign or nothing felt
-TRUS Biopsy Nov 08: 5 of 8 cores positive GS 3+3 or 6. 30-65%. Perineural invasion.
-General Health: pretty good, 5' 10", 180 lbs, slim.
-Open RP surgery: May 09 both nerve bundles spared. Bilateral lymph node dissection performed. Discharged 48 hours after surgery.
-Post Surgery Pathology: pT3a N0 MX, extraprostatic extension (EPE), stage III prostate cancer, lymph nodes clear, seminal vesicles clear, Gleason upraded to 3+4 GS 7. EPE within surgical margins. Other than prostate and EPE, all tissue removed negative for cancer involvement.
-Bladder control within 48 hours of catheter removal
-ED ongoing but improving significantly with Trimix at 7 months post-op. Oral ED meds didn't do much.