>>76544870 (OP)
Idk who that is but there's a difference between doing a handstand or some gymnastic tricks and actually being a gymnast.
The flat gymnast you are thinking off are competitors, most likely Olympic gymnasts and ofcourse those are flat because their training to get there is far more intense, they typically have very square looking upperbodies because they have more muscle mass and less fat, thus less tits.
Whoever this is she is likely an e thot that can do handstands and some tricks and that's it, if she is actually a real gymnast, as in that she actually competes in it then she is just genetically gifted to having big tits.
It's not that complicated.