One of my interests is how to coach running technique. I came across these two videos:
http://www.youtube.com/watch?v=Q0sgLIgqr18, http://www.youtube.com/watch?v=ikUkGntOOUE
They seem to take information from a range of running models, including Chi running.
There are a number of tips in the clips, but the key ones for me are 1) lean forward from the ankles 2) have your feet land on the midfoot and under your centre of gravity 3) use a high cadence (180 strides per minute) 4) increase your “stride angle” by increasing flexibility.