For 99 percent of racers, a slow start out of the blocks spells disaster. For Bolt, it just adds to his legend. The Fastest Man on Earth overtook American sprinter Justin Gatlin to become the first sprinter ever to capture three straight gold medals in the 100m (for good measure, he captured his third straight gold in the 200m four days later). Take a look at how world-class Olympic and Paralympic track-and-field competitors obsess over body positioning and rhythm to explode off the start line.