A Horse is "Round" when he is over collecting...I.e. Too "rounded " to see the jump.....bending from 3 rd and 4th vertabrae.....
unless you are referring to his bascule in the air....the apex that is them at the top of the jump....
Percheron,shire,clydesdale,belgian draft,
Stall companion...goat
Horses begin to crib out of boredom....it quickly turns into a very nasty habit...with ill effects
Bits... snaffle,pelham,kimberwicke,elevator,gag
"above the bit"....or "above the bridle???" i would guess that you mean the same...
above the bit...raising head too high too avoid contact...sit quietly,using the lower part of your legs,the back of your calves...drive him forward into the bit...or bridle as we say.....practice your bending and flexing to make him accept more.....
slap a standing martingale on him...perhaps a bit that occupies his interest more....
however, if your horse has his tongue...above the bit....get of...they have no feeling under their tongue....you have no brakes if that were to happen