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Really, then why aren't all 100meter dashers excellent football players?

The 100meter is run in a straight line.

The 40yard is a better metric of the ability to change directions and accelerate.

My understanding of gridiron is that it is rare to run that far.

because football coaches look at things besides your 40m dash. but that doesn't mean looking at your 40m dash isn't a useful thing to look at.

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