In this video LaMarcus Coker #22 Former Starting Running Back for University Of Tennessee (Knoxville) issues out a challenge to Chris Johnson #28 starting Running Back for the Tennessee Titans, for a chance to beat Chris Johnson record 40yd dash time of 4.24... Although Coker runs a 4.34 in this video, the running terrain must also be considered, the running field is not that of wich the 40yd for record is usually tested on.
en.wikipedia.org/wiki/LaMarcus_Coker

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