more than just an exercise machine!
this is a very good exercise ball but like glowsticks at a club, the powerball looks good. If i bought a powerball it would be one with flashing lights, they tell u how fast your going and they provide an interesting lightshow if four people had one in each hand in one room!! try the powerball its very fun and also a good stress releaver. also if youve broken an arm and need to regain your strength in it, somtimes weights can be very painfull on the recent repared arm. the powerball operates with alot of torque at low speeds and buckets of power at high speeds. also if you play sports with alot of arm action, or if you play an intrument with alot of arm action or the drums. The powerball can help you, not expensive either for what your getting! ingnore anyone who say that these are bad! their brilliant!