Hurdling hurdle over various natural obstacles, such as logs, mounds of earth and small streams – this represents the sporting origin of the modern events. Horse racing has its own variant of hurdle racing, with similar principles. The standard sprint or short hurdle race is 110 meters for men and 100 meters for women. The standard number of steps to the first hurdle should be 8. The standard long hurdle race is 400 meters for both men and women. Each of these races is run over ten hurdles and they are all Olympic events. The men's 200 meters low hurdles event
2005 World Championships in Athletics – Women's 100 metres hurdles the lead while Hayes again was matching Perry stride for stride until Hayes hooked the ninth hurdle. She lost her balance between hurdles so much she never jumped the tenth hurdle, instead carrying it some seven metres down the track before pushing it away and striding over the finish line in last. With her last challenger suddenly out of the race, Perry ran in to the finish with a 1-metre lead over Ennis-London, who was less than a half metre ahead of her teammate Foster-Hylton across the line for silver. All times shown are in seconds.<br> Q denotes qualification by