Kottke: Avg dude vs. pro football player in 40 yard dash
kottke.org
kottke.org
http://www.nfl.com/videos/nfl-combine/09000d5d816ad7b3/Eisen...
The guy in the suit?
The fastest player was Jacoby Ford with a 4.28s 40-yard dash. http://www.nfl.com/combine/top-performers?tabIndex=0
The general idea is that you raise your knee with your lower leg pointing downwards, and then rip backwards, extending your leg as you do so. You don't want to go up at all, just forward.
The other thing to do that he's not is move your arms more efficiently. Your elbows should be locked at about a 90 degree angle, and your hands should be relaxed. Your arms drive your legs, not the other way around.
(I ran indoor track when I was in high school. My main event was the 55m dash.)