Why do you run?

It was a long week.  Lots of driving, lots of meetings, lots of sitting.  I did get to FitClub twice and I ran twice (hoping for a good long run today).  Yesterday, as I sat a workshops, I felt edgy, almost jumpy.  I doodled on my notes, circles upon circles upon circles.  When I came out of my last workshop, the skies had opened up and the rain was coming down.  My only exercise would be practicing drums (which is great for your hip flexers and calf muscles). 
After dinner, I flipped through my twitter feeds and found this one from runnersworld - Why do you run?

I run because I want to be healthy
I run because I want to have stamina
I run because I want to know that I can push myself
I run because I enjoy being out on the trail
But mostly I run because I was given the gift of this body, mind, and heart and I am thankful for that

Would love to hear why you run, or walk, or bike or do that extra thing that helps you take care of yourself.