Imagine doing a block of your local neighbourhood – let’s call it an 800m block – over and over and over again – for 7 weeks – 18 hours per day – 5649 times. Have a go at getting your head around that and you’ll no doubt have an enormous amount of appreciation for our guest today.

Grahak Cunningham won the 2012 Sri Chinmoy Self-Transcendence 3100 Mile Race in New York and he’s been crazy enough to run it four times. He’s the author of “Running Beyond the Marathon – Insights into the longest footrace in the world” and he joins us on 100 Not Out today.