Listen Here FFWD to ~40mins to hear interview The Barefoot Runner Michael Sandler. Had a bad accident while training for the Tour de France. Then had a bad accident while training for a crosscountry rollerblade event. He then found the only exercise he felt comfortable doing was running. A series of running-related injuries caused him to reduce cushioning and support until he was barefoot.
His first day running barefoot was 100yards - rest a few days, then 200yards, etc... 3 months later he is trucking through a 10km at a personal record pace.
Michael then wrote a good book on barefoot running.