I don't even attempt to use it when DD is around. Anytime I try to sit on the floor or lay down she thinks it's an opportunity to climb on me like I'm a human jungle gym. Add an exercise ball into the mix and, well, it's a lost cause.
Her favorite game so far is to nestle the ball into a bean bag chair, then to jump like crazy while holding my hands. We've found that the whole setup is pretty stable if we put the bean bag chair/ball setup into the corner of the sectional sofa, then throw a few pillows on the floor "just in case." Luckily DD is a jumper, but not much of a thrower, so the ball doesn't see a lot of air time.
She actually has a Rody horse that's a rubbery inflated thing MADE for sitting on and bouncing yourself silly - but she prefers the ball. Meh.
Follow Mothering