At the risk of inviting the usual lets run ridicule that often attends to any Prefontainian reference, I offer the following quote from Bill Bowerman, as portrayed in Without Limits:
Running, one might say, is basically an absurd pastime upon which to be exhausting ourselves. But if you can find meaning in the type of running you need to do ... chances are you'll be able to find meaning in that other absurd pastime - LIFE.
That says it very well, as far as I'm concerned.
I remember in high school my friend and teammate's mother asked him whether when he was running he thought of himself as running FROM something or TO something and he said, "Neither, I'm just running."
That has always been enough for me.