Ever thought of asking you doctor?!?!?! people on discussion boards tend to go beyond their scope of practice. You never know what types of issues may rise from training after your surgery, always always always take the safe route and ask your doctor, the worst case senario is you'll be referred to a specialist.
I'm a certified personal trainer and S/C coach for a major university and i'd never give post-op clients or any of my athletes advice before first going to their doctor to find information on their file.
You make a good point. I did ask my physician, who said simply that I could resume normal activities at six weeks. I had told him that I do aerobics, weights, and stretching. He said I should be ok to exercise again at six weeks. Considering the age at which the average man has prostate cancer surgery, I doubt that he encounters many who regularly lift weights.
I guess my real question is how to begin again after not lifting weights for two months. One of the earlier responses was helpful in saying to start at half the weight of my one repetition maximum. I'll probably start even a little lighter than that.
Thanks to everyone for your responses.