If you want maximum results in your run time, you must make the following changes to your form.
*keep you center line straight
*push your pelvis forward
*do not let your heels carry any weight( they may touch)
*pull with your hamstrings
*elbows behind you, hands move forward and back( minimal up and down, in an oval fashion )
*watch where you are going
I know what you are thinking,that's a lot of stuff to think about while i'm trying to relax.But once you get a handle on this technique you will be a much faster runner.Be prepared for the sorest calves of your life, this will be the first time you have ever used them.If you really want a challenge, master running downhill like that( pick your feet up ).
I learned this from a book written by danny dreyer, entitled chi running.very good read i reccomend it to anyone who wants an in depth explanation of how to use the spring naturally in your body. there other ways.