Its nice to have someone on here that looks how we all want to look.
Something that I've always wanted to ask a successful bodybuilder, how many crunches, situps, pushups, etc do you do every day, and do you do them with added weights? Also when you lift weights, what kinds of lifts do you do and how much weight do you use for each? And do you maintain good form the entire time, or do you do as many as you can with good form, then do a few more with bad form?
Unfortunately, I hate to break the news to you about asking a bodybuilder's advice on exercises to get the muscular definition they have. It's great to ask for tips since they have the experience but to get the body they have, it has very little to do with their exercises. I'm referring to steroids. I spent four years of my life eating extremely high protein, high calories, and doing bodybuilding routines up to 4X a week and got very little out of it. I've worked out with bodybuilders who shared their routines but the only thing they won't share are the "supplements" they take. I would rather take exercise advice from a guy like Bob Harper on the Biggest Loser than a bodybuilder anyday. I am not putting bodybuilders down because I know they work their tails off, but when it comes to muscle build and definition, it's at least 75-80% diet. I still have much respect for bodybuilders and that doesn't turn me off from accepting that I will never legally have that kind of physique. Sorry if I looked too much into this.
I agree with you Nick about genetics. There are people with great genes and it takes little effort for them to build muscle. I was told by a bodybuilder when I first started weight training that if a guy has 18" arms and six pack abs, he's either genetically gifted or on the juice. There is no in between.