On Six-Packs and DNA
FitnessFixation has a good, forthright post up, Why You May Never Have a Six-Pack. But as much as I enjoyed the post, and as much as I think genetics play a role, I do feel genetics can, in many cases, be overcome. There's the Larry Bird argument, of course (he never seemed to me overburdened with tremendously athletic genes, although he was tall). And it's true that no matter how much I train my arms, and how hard I flap, I'll never be able to fly like a bird. But I don't think having the body that you want quite falls into the same category as the true immutables.
Or, to quote the greatest animated movie ever, The Iron Giant, "you are who you choose to be. Choose."
(That said, I wouldn't obsess over the six-pack quest, and if thinking it's impossible helps you not obsess, go right ahead and think that. And FF might be right, I certainly haven't studied this stuff.)