Why can't these professional athletes get themselves a BowFlex and stay in shape? I mean really, it's not that hard esp when one doesn't work a desk job 10 hrs a day.
I imagine when you're that large it can be pretty difficult to keep your weight down
I imagine it takes a lot of food to stay that large.
Maybe 3 meals a day instead of 5?
I think somebody that large might have a greater appetite than the normal person, but I doubt it's as difficult for them to "stay that large" as you think. A guy like BBD has a naturally large frame and build, so he adds pounds and keeps them on pretty easily. A guy like KG - yeah, it would be hard for him to gain a lot of weight and keep it on; that's just how he's built. BBD is not built like your typical NBA player, so it's not that easy for him to stay thin.
It's true of normal people that build plays a lot into their physical fitness, but I have a feeling that when you're that much larger it sort of amplifies it; if you're thin, you're really thin, and if you're large, you're really large.