Josh Kerr, who competes primarily in the 1,500 metres, had been targeting the record as part of what he called 'Project 222' - and today, his attempt in London was successful

At the London Diamond League on Saturday, 2024 Olympic 1,500m silver medallist Kerr will try to beat a time that has stood since 1999.

To support Kerr's attempt to break the men's mile world record, there's been plenty of research, testing and product development