automatthew saidthe "real" in realjock recalls fairly clearly the image we're all supposed to be striving for.
I dunno, to me being a "real"jock isn't about having big muscles or looking like a Greek statue, to me being a "real"jock is a state of mind. I, for example, am a bike commuter, I play field hockey, cycle, swim, do triathlons, hike, climb, and in general am down for playing almost any sport, all with the average body I have. To me, I'm more of a "real"jock than gym bunnies who spend 30 hours a week in the gym just to have pretty shiny muscles to look at.
I think the insidiousness of BDD is that if you read about it, I'm sure if you read over some of the compulsive behaviors/symptoms of it, almost anyone will notice a couple of things they do that are BDD-like. I'm sure I've known people with it, even if they haven't told me, and I have some friends who would probably never admit it, but definitely have it.
But all in all, BDD is the simple one. It's BIID that just blows my mind.