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In terms of judging a person's speed, the best method of timing is through lasers which start and stop the times when passed through. A laser start (from a stationary position) is more accurate for measuring pure speed as it does not register a runner's reaction time, however, this method of timing a 40-yard dash can affect the accuracy by as much as 0.5 seconds with the manual stopwatch method.
The fastest official time in the 40-yard dash is held by former Texas receiver Xavier Worthy, who broke the record on Saturday with a mark of 4.21 seconds. The previous record was set by ...
The fastest-ever recorded 40-yard dash time was set by Washington receiver John Ross III in 2017. He ran an official 4.22 in the event, the fastest ever recorded at the combine.
Before Worthy, John Ross held the official record for fastest 40 at the combine. Ross ran it in 4.22 seconds and became the ninth pick of the 2017 draft to the Cincinnati Bengals. Ross had 957 ...
All of these factors make track and "football 40" performances essentially impossible to compare. The world best time for a "football 40" is 4.17 by Deion Sanders, while the extrapolated best for an Olympic-level athlete (including reacting to a starting gun) is 4.24 by Maurice Greene at the 2001 World Championships in Athletics.
The world record in the mile run is the fastest time set by a runner in the middle-distance track and field event. World Athletics is the official body which oversees the records. Hicham El Guerrouj is the current men's record holder with his time of 3:43.13, [1] while Faith Kipyegon has the women's record of 4:07.64. [2]
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Further distinguishment needed between unofficial fastest times and official, electronically timed fastest 40s, registered with the league. As an example, the difference between Bo Jackson's unofficial 40 time, and the one he officially registered with the league is about 0.20. I think it was claimed he ran 4.08 in team practice.