what is the name of the smaller, specific ball Abbie uses for the triple action ab video?
Yes, I watched that a while back and it is either a Bender ball or a similar ball. But if think about for a while, you can probably think of a perfectly good substitute “ball” that will cost you about $2.00 at any department store. And you just inflate it to the support you want just like a $10 Bender ball.