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What is a Powerball? And what does it do?

Amazon is touting them as some amazing fitness contraption, but I haven't the darnedest clue what they actually do.

i bought one of these for my bf for last christmas, among many other things. Its a gyroscope, basically a little spinning thing inside a ball that you hold onto which revs really high and creates a g-force within your hand. Controlling it while its spinning enhances your forearm and wrist. www.powerballs.com has more information. lookss like a toy but once you use it its like, whoa...

Sounds interesting. Is it at least fun to use?

lol.. yeah well the boy is using it :P apparently also good for mucisians and people who play sports where you need strong wrists ie golf, baseball, tennis...

its fun but a weird sensation...

Ok I posted something wrong here, and I had to edit because I have nothing at all to say about a powerball? Maybe I'll post a photo of one?



And powerballs.com is quite a funny domain.