If you enjoyed this article and are unacquainted with the world of running, I highly recommend the book "Born to Run" by Christopher McDougall.
There's no need to know that any of this even exists in order to enjoy running, that's part of running's beauty. But there's lots to know if you want to.
p.s. I should add that Born to Run is an interesting read about a part of running that lots of runners don't know much about.
Another really good running book for those still following along: Once a Runner -- http://www.amazon.com/Once-Runner-John-L-Parker/dp/091529701...