With the talk of Jone's 40 versus game speed I was thinking that maybe acceleration/deceleration may be a better measurement over the span of 40 yards.
If you graphed the time it took the player to reach i.e. 20 mph from the start and then see when the plateau is hit and where the deceleration begins could maybe measure the player's burst more accurately than the other current drills.
just a thought
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