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Even world-record-holding athletes can be surprised by their personal feats. Norway’s Karsten Warholm crushed his own world record to win the men’s 400m hurdles final in 45.94 seconds on Monday night.

DES MOINES, Iowa (Reuters) - Olympic champion Dalilah Muhammad smashed one of athletics' oldest world records when she stormed to the women's 400 metres hurdles title in 52.20 seconds at the United ...

On July 1, Warholm broke American Kevin Young's 29-year-old world record of 46.78 seconds at a Diamond League meet with a time of 46.70, and he blew by that mark just over a month later to win gold in ...