Olympic champion Mo Farah broke the one-hour world record on his return to the track at the Diamond League meeting in Brussels.
The rarely run one-hour race, athletes try to cover as much distance as possible in 60 minutes.
He ran 21,330m, bettering the record of 21,285m set by Haile Gebrselassie in 2007.
“I’m very happy to break the world record today. What an amazing way to do it and to show people what is possible,” Farah said.
“I feel tired but it’s nice to break a world record.”
It is the 37-year-old Briton’s first world record outdoors.