The Powerball gyroscope can aid those athletes in disciplines that require strong arms, shoulders or grip. The basic theory centres around how gyroscopes act on the environment around them. Once a gyroscope has started, then it asserts a centrifugal force and inertia on objects in contact with it. This all sounds very high tech, but it is a very clever piece of applied science using the theory behind gyroscopes and the principle of precession. It can used in a fitness, sports, rehabilitation or fun manner. Music, Picking, strumming, holding, twisting, see marked increases in wirst and finger strength - essential for all musicians Effectively this is the same as carrying around a set of dumbbells in your pocket! When first using the device, muscle burn and discomfort can occur, as is normal with any exercise, but this fades over time if used regularly as the muscle will tone and strengthen. As you build up the speed, measured in revolutions per minute (rpm) the greater the torsion and dynamic forces acting upon your wrist, lower and upper arm muscles, depending on the arm orientation and direction of spin. The gyroscope will respond with a rolling action and the speed of the device the forces generated

    ThinkGeek :: Dynaflex Powerball Gyroscope
    Dynaflex Powerball Gyroscope - Awesome blue LED glow - the world's most powerful hand gyroscope here is a new toy for you - the Powerball in glowing Blue.

    Powerball Gyro, Gyroscope, Neon Pro, Powerballs
    The Powerball Gyro builds strength in wrists, arms, shoulders and fingers with only 5 minutes use per day making remarkable increases in strength.