Running Up That Hill is a celebration of endurance running. Of running ridiculous distances through cities, over mountains and across countries. Distances most people couldn 't even imagine. But sports presenter Vassos Alexander is hooked!

Why else would he run an ultra in Paris, backwards, having missed the start' Why head to Wales for the world 's hardest mountain race with a badly sprained ankle' And why follow in some unforgiving, ancient footsteps and attempt the oldest and toughest footrace on earth, the 153-mile Spartathlon'

There 's joy to be found here. Really there is. Vassos recalls his own assaults on these gruelling races, along with ultra-running legends including Scott Jurek, Jasmin Paris, Kilian Jornet, Mimi Anderson and Dean Karnazes. They all testify to the transformative power of endurance running.

It 's about the astonishing highs that come from pushing your body to the limit. The confidence and peace when you challenge yourself and succeed. All told, this is a cracking tale of what keeps ultra-distance runners running, mile after mile after mile.