A combination of four single images shows Karsten Warholm of Norway reacting after realizing he had set a new world record Tokyo 2020 Olympics Athletics Men's 400m Hurdles Final at Olympic Stadium, Tokyo, Japan, August 3, 2021. A world record had been predicted but Norway's Karsten Warholm had to utterly destroy it to hold off American Rai Benjamin and take gold on Tuesday in the men's 400 metres hurdles. REUTERS/Phil Noble

Karsten Warholm of Norway in action on his way to winning gold alongside silver medallist Rai Benjamin of the United States and bronze medallist Alison Dos Santos of Brazil during the Tokyo 2020 Olympics Athletics Men's 400m Hurdles Final at Olympic Stadium, Tokyo, Japan, August 3, 2021. Warholm broke Kevin Young's 29-year world mark with a time of 46.70 seconds but he blew his own record away with an astonishing 45.94 run. REUTERS/Phil Noble

Karsten Warholm of Norway in action on his way to winning gold alongside silver medallist Rai Benjamin of the United States and bronze medallist Alison Dos Santos of Brazil during the Tokyo 2020 Olympics Athletics Men's 400m Hurdles Final at Olympic Stadium, Tokyo, Japan, August 3, 2021. REUTERS/Kai Pfaffenbach

Karsten Warholm of Norway celebrates as he crosses the line to win gold during the Tokyo 2020 Olympics Athletics Men's 400m Hurdles Final at Olympic Stadium, Tokyo, Japan, August 3, 2021. REUTERS/Phil Noble

Karsten Warholm of Norway reacts after winning gold and setting a new world record during the during the Tokyo 2020 Olympics Athletics Men's 400m Hurdles Final at Olympic Stadium, Tokyo, Japan, August 3, 2021. REUTERS/Andrew Boyers

Karsten Warholm of Norway poses next to his new world record as he celebrates after winning gold during the during the Tokyo 2020 Olympics Athletics Men's 400m Hurdles Final at Olympic Stadium, Tokyo, Japan, August 3, 2021. REUTERS/Dylan Martinez