A pair of intrepid runners have pushed themselves beyond the limit of human performance to simultaneously break a coveted endurance world record
John Stocker and Matt Blackburn achieved the Herculean feat during an event at Knettishall Heath, on the Suffolk-Norfolk border.
They had begun competing at lunchtime on Saturday (June 5) in the Suffolk edition of Back Yard Ultra, which challenges participants to repeatedly run a 4.167-mile trail route.
Those taking part have one hour to complete each loop and must be back in time to start the next - or they are knocked out.
The race continues until only one person is left competing.
As of Monday afternoon, Mr Stocker and Mr Blackburn had been going head-to-head for 76 hours. The previous record of 75 hours was set in Belgium last year.
There will not be an official winner of the event until one of the two fails to complete a solo lap within the hour.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here