On a Yoga Ball

I've recently started using a yoga ball instead of a chair at work. I thought it could help strengthen my abdomen and back muscles since I was injured in a skiing accident and needed some self-administered rehabilitation. I also thought it could help improve my posture, since I have always had the posture of a mound of Jell-O. I didn't start using it to achieve a higher level of Eastern clarity and eventually have a zen-gasm. Now I find myself slouching all over it like chocolate syrup on vanilla ice cream. But it's bouncy and I can also do this really cool trick where I set the ball in an open path and run and dive at it, rolling all the way across it from my fingertips, down my extended arms, across my straightened body to the tips of tippy-toes. For a brief moment it feels like I am flying. On a yoga ball.