![]() ![]() All team members in a relay race must be of the same nationality.Except in road events ( road running and race walking), the performance must be set in a single-sex race, with the sole exception of the mixed-sex 4 × 400 m relay, introduced by World Athletics in 2017.In road events, the course must be accurately measured, by a certified measurer. The dimensions of the track and equipment used must conform to standards.These criteria also apply to national or other restricted records and also to performances submitted as qualifying marks for eligibility to compete in major events such as the Olympic Games. The criteria which must be satisfied for ratification of a world record are defined by World Athletics in Part III of the Competition Rules. The only non- metric track distance for which official records are kept is the mile run. Unofficial records for some other events are kept by track and field statisticians. ![]() ![]() Records are kept for all events contested at the Olympic Games and some others. Athletics records comprise the best performances in the sports of track and field, road running and racewalking. World records in athletics are ratified by World Athletics. Jürgen Schult beside the indication of his new discus world record, 1986 ![]()
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