Hurdling is an athletic discipline in which athletes run and jump over a number of obstacles called "hurdles" to win the race. In hurdle racing events, a series of obstacles known as hurdles are set at the predetermined distances and heights through which each athlete must pass by running over it. Hurdle races were first popularized in the mid-19th century in England. In 1830, the first known event of 100-yard took place over heavy wooden barriers. The origin of 400m hurdle races lies in Oxford around 1860. Hurdle events are included in the combined event competitions like decathlon and heptathlon. The 100m, 110m and 400m hurdle events are also a part of the Summer Olympics.