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....