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. All athletes need to build strength for their chosen sport, the Powerball gyroscope is an excellent tool for athletes of all levels, it is also gaining a very healthy reputation for rehabilitation for arm and wrist injuries. Athletes of all levels can use the Powerball to build, tone and strengthen the muscles and ligaments in the hands, wrists, arms and shoulders. If for some reason you have an injury to your arm or wrists then the Powerball can be used by anyone from young children to old aged pensioners due to it's dynamic, non-impact nature. The Powerball is also being used to help with Golf, Baseball, Tennis, Hockey or Squash building arm strength and in such sports as climbing, rowing, mountain biking or motocross working fingers, hands, wrists, forearms and shoulders. Due to the dynamic nature of the device, the force achieved from the device is grooved near the axle, so with an externally applied force, the axle will push against the rim. This has been proven to directly translate into a major boost in

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    Amazon.com: Digital Speed Meter for Dynaflex Powerball & Pro Plus: Sports & Outdoors The Digital Speed Meter works with the Dyna-Flex PowerBall & Pro

    Dyna-flex Digital Speed Meter for Gyro Trainers - SHOP.COM
    dyna-flexdigital speed meter works with the dyna-flex powerball to display .Shop for Dyna-flex Digital Speed Meter for Gyro Trainers at Shop.com