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DeFrancosGym.com: Keith Williams runs a 4.21 40-yard dash!!
DeFrancosGym.com: Fastest Sprint in History!!!
DeFrancosGym.com: Lowell Robinson runs a 4.33 40-yard dash!
DeFrancosGym.com: Chris "White Lightning" Hogan runs a 4.39 40-yard dash!!
DeFrancosGym.com: How to Run the 40 Yard Dash in 4.2 seconds!!!
DeFrancosGym.com: Utah State RB, Mike Smith, runs the 40 Yard Dash in 4.2 seconds!!
DeFrancosGym.com - Brian Cushing 40-yard dash start technique
DeFrancosGym.com: Keith Williams 60" box jump!!!
DeFrancosGym.com: Keith Williams compilation video
NFL Combine: Correcting the 40-yard dash starting position with Joe DeFranco - Part 2
DeFrancosGym.com: Keith Williams SUPERHUMAN display of POWER!!
DeFrancosGym.com: Chad "The Sniper" Faulcon 40 Yard Dash!
