I had 3 years of ADT. Apparently some people tolerate it better than others. I was fairly lucky. The side effects weren't fun, but they weren't horrible, either.

My only regret is that during the ADT I didn't work out much. I was tired, so I took naps. I should have continued to lift weights, because I did lose a lot of muscle strength during treatment.

I have since resumed lifting weights (stopped ADT a year ago), and I have regained my strength. If I have to go back on ADT (which is likely, because my Gleason was 9), I'm going to make a strong effort to continue lifting weights to maintain strength.