One of the best kept secrets regarding how to increase your running speed is this: The running motion involves one push phase and two pull phases with your legs. However, 99.99% of any persons training when it comes to trying to increase their speed involved leg exercises that only push and never pull.
If you want to dramatically increase your running speed and maybe learn how to run a faster 40 yard dash, then watch this video. To review some of this information in Spanish, go to: http://www.VelocidadAtletica.com