You do stuff like this. I'm working with a shortened form of this, and need to snag the full version somehow (I was under the mistaken impression that this would be one of the exported product lines Gaiam would do -- ahahaha).

There've been one or two pretty crappy ball releases over here by other companies, but most of what I've been able to find have been books; these are not desperately useful when you're upside down and bent up strangely.