how can you time a 40 yard dash?

Posted in Clocks by admin on October 4, 2009
clock movement
ugadawgs asked:


I ran a 5.18 when the time keeper started the clock on my first movement, but i ran a 5.55 when the time keeper started the clock on go. What is the proper way to time a 40 yard dash.
im in eight grade 5′9 and 155lbs

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