Today I hit the brink. Meaning, during the final sprint of my run, I felt like I was flying; my surroundings zoomed past me and my legs seemed to have a life of their own.
The phrase "hit the brink" isn't any sort of technical term, or even common running jargon. It's just a phrase that I came up with on my own, for myself. It's just what comes to mind.
This feeling is not one that I get during every run, or more specifically, every sprint. But I know it when it comes. I remember the first time I got this feeling was Turkey Trot 2010. The final sprint at the end there. I felt like I was flying.