haha
a few years back i decided to do some flat DB presses on a ball, not thinking too in depth tho, a 330lb man, doing 160s, i blew that bitch out like a 18yr old porn star lol
luckily i was able to drop the DBs to the side n not on my face
as for abs, i used to, now i use it for stretching my back n doing side bends
frk