It is a small ball with more than one axis within a larger ball. A string wound around the central sphere, a tug and the inner sphere is spinning. Now, twist your forearm. The sphere is using friction to accelerate.
Think of hula hoops, but for your wrist and forearms.
So now you are holding up to 38 pounds (depending on how fast you get the ball spinning) of force in your hand. Torsional force, by the way...twisting force.
And so the more you twist, the more friction is generated the ball continues to spin.
A workout for your hand, fingers, wrists and forearms.
Thankfully I found one without lights, or a built in speedometer, or a spinning station for those who find the starting via string method taxing or beyond their grasp. (I see what I did there)
As a kid I recall having two small balls (enough with the snickering) of differing hardness and a regime of exercises I followed daily. They were easy, could be done while I was engaged otherwise...In short unobtrusive and they produced results very quickly.
So if this proves beneficial I shall have to plan for the metal versions which are $100 or more.
It can be a point of focus and discipline and beneficial to my playing as well.
I found the one in the top photo on Amazon for $17.29 with a 15% off coupon (only available to customers in this country it seems), which brought the total with tax and shipping to $15.98.
As I am fond of saying - we shall see.
04/17/13 I feel the "burn" after a simple five minute workout. I do thirty seconds with each hand and then switch. It's not quite a pain, more of every muscle in my arm is tight, in use.
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