re: What would Usain Bolt's 40 yard dash time be?

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That is a myth. World class sprinters. Can run in the 4.1 range. Prob only 1-2% of man kind can run an electric 4.30

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Yes it is a myth under the current timing setup used at the NFL combine. Trindon Holliday and Jacoby Ford are legitimate world-class sprinters and they ran 4.34 and 4.28 respectively. Also, remember that runners at the combine have two things going against them compared to runners at track meets. 1) The field turf at the combine is a much slower running surface then the mondo used for modern tracks. 2) Runners at the combine don't have the benefit of starting blocks that runners in track meets do. IMO, these two things negate the advantage of reaction time. Here's a video of Trindon taking down a world-class field in the 60:

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