Actually, it's the average speed of the last 60'. For most of us, there's not a great deal of difference in speed at the start of the traps and at the end.
And speaking of 60'...do you realize that if your 60' time is say about 2.2 that you're just barely twice as fast as your basic 300 lb NFL lineman...on foot...in full gear? Just a random thought that went flying by.
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YO! Barry! You LOST!