QUOTE(iamyuanwu @ Jun 20 2010, 02:14 PM)
No opinions. It's just like gasing or yo-yo. If you use a heavy enough gasing or yo-yo, you might gain a wee bit of strength. But that's not the purpose of gasing or yo-yo or Powerball.
If you think you'll enjoy using/playing it, why not?
Not everything has to be about building muscles or getting bigger.
Thats cos TS is askign if it can really build up arm muscles.
cos this pwoerball in their site CLAIM can work forearms, biceps, triceps and shoulders...
TS, what is your goal? if u wanna look like arnold, you better do what armold did.
look at the fellas that use powerball, do they have the physique you want?
your answer is right there.