Before you go apenuts on me, read this:
http://www.unm.edu/~lkravitz/Article%20 ... etics.html
Without rosying anything up or trying to bull$h1t you or convince you that I'm right, I'll lay it on the line right now. Your physique and ability to power lift is determined more through genetics than through hard work.
I must add to that statement, however. It doesn't mean that you can be a couch potato and become Mr. America. It doesn't mean that one person who has good genetics can half-ass it and be better than those who don't have as good genetics, but work harder. What it means is that if you compare two people who work just as hard as each other, yet one person has superior genetics, the one who's genetics are better will come out on top. It also means that you can do as many weighted crunches or abdominal exercises as you want, but you may never get that six pack.
The elite bodybuilders of present and past all had ridiculously good genetics. Look at Jack Lalanne who is pushing 90 yet still lifting regularly. It's a tribute to his genetics, not his hard work, that gives him this ability.
This isn't discouragement to any of you from working out and building your physique. Your true potential can only be brought out by work ethic. However, you just have to know that there are people in the world who are genetically inclined to look better and be stronger.