[WalterBright]

It doesn't mean they lift their entire body up 6 ft. They just have to be high enough to clear the belly while lifting their legs up. Just like steeplechase runners do. High jumpers never have their center of gravity above the bar, they just kinda fold themselves over it.

[manchego]

I read this and thought surely the center of gravity still has to pass over the bar. But right you are, the center of gravity can pass below the bar since it's just the average point of the mass. Cool!