Super way to beef up the forearms !!

By cons, do not expect to watch a movie while you use it, because of the noise. It's very noisy!

Having tried the classic Powerball, you must insert the small string Powerball to launch (if you have not lost the thread ...), and now this one with the auto start, I concluded that it ' is just great! I do not see why all the same powerball are not equipped.

On top of all, it's really fun to see friends try to do;)