4 × 100 metres relay a cinder track at the 1964 Tokyo Games. The women's world record stands at 40.82 seconds, set by the United States in 2012 at the London Olympics. According to the IAAF rules, world records in relays can only be set if all team members have the same nationality. 4 × 100 metres relay The 4 × 100 metres relay or sprint relay is an athletics track event run in lanes over one lap of the track with four runners completing 100 metres each. The first runners must begin in the same stagger as for the individual 400 m race. A
800 metres have been known to use a negative split to their advantage. A positive split is achieved by running the first lap faster than the second lap, and a negative split is achieved by the opposite, running the second lap faster than the first could help. The current world record holder, David Rudisha, runs using a positive split strategy. In his 2012 Olympic race, he ran his first lap in 49.28 seconds and his second lap in 51.63 seconds. Theoretically, an even split is the most effective strategy, but it is nearly impossible to achieve due to the race's length. As