Rob Pope catches up with British adventurer Anna McNuff, who ran 2,352 miles completely barefoot across Great Britain. That's the equivalent of 90 marathons over everything from gritty tarmac to muddy moorland.

"By the end, the last two weeks, I was just a shell of a woman. I just wasn’t even there. I was going through all the motions but mentally I was gone..." reveals Anna, as she explains to Rob the mental toil she was feeling as she approached the London finish line -- having travelled all the way from the Shetland Islands.

From how she coped mentally with such a long (and often painful) journey, to how her body also learned to adapt to the relentless stress and exposure, Anna gives an epic insight into the workings of her mind and body as she pushed them to their limits.

Anna also reveals what went into preparing for the challenge – namely, the one-and-a-half years she spent learning to run barefoot – as well as her motivations for doing it. And she reveals some of the unforgettable moments and encounters she had along the way that made all the hard graft worthwhile -- including one particular 24-mile run that she enjoyed with one giant, and very inspirational, lobster...

Read more about Anna and her adventure at https://win.gs/BarefootBritain

Listen to all episodes and discover more about How to Be Superhuman at http://redbull.com/superhuman