Yannis Kouros is an ultramarathon runner. He first gained attention in 1983, when he won the SPARTATHLON, 　　a race tracing the distance Pheidippides had ran in ancient times. Since then, and for over 20 years, he had been 　　the constant record holder in ultra-distance racing, some times running for ten days continuously, with only few stops for sleep. 　　Much as he enjoyed internation...