Precisely! After just getting my BOSU last night, and doing the video that came with it, I can totally agree. I think the key word IS stability. You get all the advantages of the stability ball, but it is stable, and you won't break your neck rolling off of it. There is tremendous balance needed, but it is all is your abs and back, not in other things trying to keep you from rolling around....like legs and arms needed to hold you still. Does that make sense?