They are right about it being a good representative of how fast you come off of the ball. For a lot of guys, they could add (or actually subtract) a few tenths of seconds off of their 40 times if they didn't ahve to start the race from a set position, i.e. if you let them get a 5-10 yard head start, start timing once they pass the '0' yard mark, and then stop at the 40 yd mark. reason being is that most big guys start slow. They come off the blocks not pushing out like trained sprinters, but more or less standing up. once they get going, they can move pretty good. but the slow start shows that the guy is that much slower coming off the ball, that much slower than the guy he needs to block, etc. If a tackle has to move up field and block a LB, who is already moving around a little bit, and is already probably a few steps faster in the 40, then coming off the ball slow, is not a good thing.Originally Posted by Just1More