Vassos Alexander has become the first known person to run the full District line route on foot, completing a 100km challenge on Sunday that covered every branch of the London Underground line.

The Track Radio breakfast host said the effort was timed for Mental Health Awareness Week and was meant to highlight how running can support mental wellbeing. Alexander called it “without doubt one of the toughest things I’ve ever done physically, but also one of the most rewarding,” and added that “even getting out for a walk or short run can make a huge difference.”

The route choice made the challenge more than a straight-line endurance test. The District line has multiple branches, and Alexander’s run followed the full network rather than a single point-to-point path. He completed the effort as a Best Known Time, adding a neat benchmark to a feat that was as much about message as mileage.

Track Radio launched earlier this month, and Alexander’s run gave the new station an early splash of attention. He hosts breakfast alongside Charlotte Daly, while Mark Pougatch and Sonja McLaughlan are also part of the presenter line-up. The station broadcasts online nationwide and on London DAB, giving the challenge a wider audience than a local stunt would have reached.

Alexander is already known for his work on Virgin Radio, Radio 2 and Radio 5 Live, but this run showed a different kind of endurance. The friction in the story is simple: a 100km test of body and mind was used to promote something much smaller in scale, the habit of getting out for a walk or a short run. That is also what made the effort land. It turned a public fitness challenge into a plain argument that movement, even in modest doses, can help people cope.

For Track Radio, the timing was no accident. For Alexander, the finish line now stands as proof that the message matched the method. He did not just talk about the value of running for mental health. He built the point into a route no one had completed on foot before.