Timbuktu, you may be right, but unless your arms are completely stiff they aren't moving directly forward, but instead in an arcing motion which again would mean they are moving through a space of more than one mile. Bernard Lagat is about as smooth a runner as I've seen, but I'm still thinking his wrists move through more than one mile of space for every 1609.xxx around the track. Either way, the visuals I got from mentally employing the invisible body suit that only exposed the arm really made my night! I dig your neuronal pathways man.

(See the pictures from right to left, bottom to top, unless Mr. Lagat really was running backwards this fluidly.)