"running unites our two most primal impulses: fear and pleasure. We run when we're scared, we run when we're ecstatic, we run away from our problems and we run around for a good time.
When things look worst,we run the most. We have seen distance running skyrocket, and its always in the midst of a national crisis. Maybe it was a coincidence.Or maybe there's a trigger in the human psyche, a coded response that activates our first and greatest survival skill when we sense the raptors approaching."
"Every morning in Africa, a gazelle wakes up, I knows it must outrun the fastest lion or it will be killed. Every morning in Africa a lion wakes up, it knows it must outrun the slowest gazelle or it will starve. It doesn't matter if you're a lion or a gazelle-when the sun comes up you better be running."
From Born to Run by Christopher McDougall