So many reasons.
The fire of inspiration.
The other-worldly calm that comes about in those self-directed moments of supreme effort.
The promise of power that unfailingly manifests itself on the other side of every single low spot.
The resounding sense of wonder.
The smile that lasts the rest of the day ... week ... month.
The gentle, easy joy of exertion.
Why do I run, you ask?
To go up. And over. And through. And on. Again and again.
Why do I run?
To chase — and some day, hopefully, catch — my very best me.