Track Radio breakfast host Vassos Alexander has completed a 100km run along the full District line route.
The challenge covered every branch of the London Underground line on Sunday, with Vassos becoming the first person known to have completed the route on foot and setting a Best Known Time.
The run was timed to mark Mental Health Awareness Week, with Vassos using the challenge to highlight the role running can play in supporting mental wellbeing.
“This was without doubt one of the toughest things I’ve ever done physically, but also one of the most rewarding,” he said.
Vassos, known for his work on Virgin Radio, BBC Radio 2 and BBC Radio 5 Live, added that people did not need to run 100 kilometres to benefit from movement.
He said: “Even getting out for a walk or short run can make a huge difference.”
Track Radio launched earlier this month and broadcasts online nationwide, as well as on London DAB. Vassos hosts breakfast on the sports and music station alongside Charlotte Daly, with Mark Pougatch and Sonja McLaughlan also in the presenter line-up.