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beternal: it`s an unbalanced gyroscope enclosed in a plastic shell, you spin the center wheel up by moving the entire thing in a circular motion. It gets harder to move the faster it spins (I could probably explain the physics of it but meh). The use of it? Strengthen your forearm muscles for a stronger grip, useful for tennis, baseball, golf, judo or masturbation.
My Powerball is noisy - should I oil it up??
They`re hard to get going, but once revved up the resistance is incredible. It kills your forearm tendons real quick.
They`ve been around since the 70`s
(it will happen sooner or later)
Looks like he`s in heavy training for the Special Olympics. :-P