Balance Ball Chair

I go down the gym with my mate, and he has higlighted to me the benefits of Balance Ball exercises. You know, things like sit-ups, push-ups etc are all possible using a balance ball, but you end up using many more muscles, because you expend a lot of energy maintaining stability. Well, now it seems, you can now sit at your desk using a Balance Ball chair. The manufacturer's say:

"Our patented BalanceBall Chair greatly alleviates the aching back/legs/arms syndrome that come from working at a desk for hours. It employs the same BalanceBall used in your workout routine, an adjustable support bar, easy-glide casters, an air pump and a desktop guide to get you moving."

You can even perform a set of 16 exercises (as you would in a gym), as pictured here. Not sure you'd get away with a leotard in most offices, though.