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I have been using different devices to strengthen my arms and wrist for many years. I race motocross and karts (electric and outdoor Sodi, etc). I have found this device to enhance my stamina and build muscles in my hands, wrist, and arms. I get less tired and I'm able to react quicker during my racing heats. It's a great workout without a normal workout session. It can be used almost anywhere. You can adjust the speed of rotation as you wish; also the duration. You will immediately feel results. Excellent.
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Sport:  Kart
Participant Since:  1996
Competitor Since:  June 2009
Birth Date:  1964
Birth Place:  Los Angeles, Ca
Gender:  Male
Height:  5'11"
Weight:  228 lbs
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More Dyna-Flex reviews
review by . March 07, 2012
Dyna-Flex - A Small Powerful Wonder
       You've probably have seen a picture of what looks like a tennis ball in plastic housing. It has no electric powered motor. What looks like a paper-weight is a modern day "productive"         This instrument is called a Gyroscopic exercise tool. A few brands have come out with their own version of this device, Dyna-Flex Powerball , NSD Powerball, and DFX Powerball to name a few. I personally have the Dyna-Flex Powerball. …
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