This is an old post, but thought it was pretty cool how you handled it. He obviously thought you two were close enough to openly talk about it. I know I personally consider my father my best friend and biggest role model growing up. I'm sure he just wanted something to establish common ground with, weightlifting is definantely a better lifestyle then everyone else his age doing drugs. I know when I first moved out I missed my father more then anything in the world, years later I still feel the same way! You should just make sure to regularly check in with him and make sure he is doing this AAS the correct way. cheers