Has anyone heard of this? Supposed to be some kinda workout-in-a-ball, based on a spinning gyro in a handheld ball. A friend of mine had one lying around and I tried giving it a spin... seemed like a nice way to build some forearm muscle. But then again, so is wanking. [roll]
http://www.youtube.com/watch?v=E0v05iaYZC0
Dunno about as a workout ball but a buddy had a ball like that with LEDs on it that he raved with... [roll]
or riding a dry clutch in .5mile a minute traffic.
They're good for rock-climbers and golfers and folks who need alot of focussed power in their fingers.
They're quite a bit of fun, actually. And will work your forearms pretty well if used correctly.
It's also funny to spin it up and hand it to a little kid to hold/wrestle. [laugh]
(https://farm4.static.flickr.com/3276/2754668614_05545a93d6.jpg?v=0)