XLR8® Power Speed Resistor - Sprint Resistor
A massively approved, tested and popular training device in New Zealand, Astralia, South Africa and the United States of America!
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Some of it's characteristics that will make it become your favorite training tool are: Easy to use, lightweight, comfortable, and durable.
Example Training Exercise Video for the Power Speed - Sprint Resistor (Available on the Resisted Sprinting Training DVD):