Dr. Phil Maffetone in a very good in-depth article over at Natural Running Center:
Many beginning runners remark about how much they enjoy the new experience. They care little about the nuances regarding form, technique, or proper gait. As long as they are moving, accumulating mileage over a sustained period of time, they feel content and satisfied. But at the advanced and elite level of running, the concept of gait takes on an entirely new dimension of complexity, constant questioning, and evaluation by a coach or oneself.
But what is exactly meant by the term “gait?”
Go read the article if you’re interested in proper gait… and you should be. Good stuff.