Original use of the gyroscopic effect

I honestly bought this product curiosity. I still do not quite understand how the fact thwart the gyroscopic effect of this device helps speed the gyroscope and thus increase all the induced torque. If someone just explain?
Otherwise regarding the use of such a product to build muscles, the fun aspect of the object makes the least painful exercise. It also helps to improve the dexterity of his left arm (for right handed I). Use in moderation to avoid trauma.