Sri Lanka, Sept. 6 -- The 400m hurdles is a scintillating track event of running at speed and jumping over ten hurdles. It is in this event that legendary Edwin Moses recorded the 122-race winning streak. In hurdling, a series of barriers known as hurdles are set at precisely measured heights and distances which each athlete must pass by running over. Failure to pass over or intentionally knocking over hurdles will result in disqualification. Hurdle design improvements made in 1935 developed the L-shaped hurdle which tip down to clear the athlete's path.

There are five hurdle heights on most standard hurdles -106.7 cm, 99.1 cm, 91.44 cm, 83.8 cm and 76.2 cm. In sprint hurdle events for men, regardless of the length of the race, the first...