Height, genetics or technique, what is it that gives Usain Bolt, the world record holder of the 100, 200 and 4 X 100 meters relay, the extra edge? Think "fastest man on earth" and the name Usain Bolt comes up. Holding multiple world records, he reigns as Olympic Games champion in the 100m, 200m and 4 X 100m relay, three times. For over a decade, his multiple achievements has cemented his name as the greatest sprinter to date. But how does he do it? Some attribute his success