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@les7spellman
Fundamental skill of highly efficient runners is allowing the upper body to travel forward while the lower body retracts backward into the ground. The inverse relationship is what maximizes propulsion. #speed #speedtips #speedhacks #40yarddash #40yddash #nflcombine To train like our NFL guys, head to universalspeedrating

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    • speed
    • nflcombine
    • 40yddash
    • speedtips
    • speedhacks
    • 40yarddash