Wanted to know how many of you actually use a exercise ball?

I came across this video and decided to give it a try. I have been doing this for the last 2 weeks. It's a little tricky at first. But, can be mastered fairly quickly. Be careful not to break your board!!!!

WARNING: I take no responsibility if anyone gets hurt.

http://www.youtube.com/watch?v=I9GYeYrfP7o