This describes the pure essence of why we run.  Spoken about Roger Bannister, the first man to break the 4-minute mile.

    “One late afternoon, after swimming in a lake, he began to jog around to ease his chill.  Soon enough he found himself running for the sheer exhilaration of it, across the moor and toward the coast.  The sky filled with crimson clouds, and as he ran a light rain started to fall.  With the sun warming his back, a rainbow appeared in front of him, and he seemed to run toward it. Along the coast the rhythm of the water breaking against the rocks eased him, and he circled back to where he had begun.  Cool, wet air filled his lungs.  Running into the sun now, he had trouble seeing the ground underneath his feet, but still he rushed forward, alive with the movement.  Finally spent as the sun disappeared from the horizon, he tumbled down a light hill and rested on his back, his feet bleeding, but feeling rejuvenated. He needed to reconnect to the joy of running, to get away from the tyranny of the track.”

                                            -Neil Bascomb, The Perfect Mile