I don't know if I've ever played a character who's close to me. There have been some elements of myself in different roles. Sometimes, I show one side of myself and then completely conceal the other.
I think if you get asked to do this, then that's called doing your homework, and I try and do it.
I couldn't get as big as a bodybuilder. I tried to put on as much weight in the right places as I could. My weightlifting was impressive for me, but not for some of the guys I see down at the gym.