Imagine 11 days with no sleep, travelling through the toughest terrain of Fiji for nearly 700 kilometres. A piece of cake right?

That's the premise of the new Amazon Prime series featuring Bear Grylls.

“World's Toughest Race: Eco-Challenge Fiji” is a ten-part series which features some of the 66 teams taking part in the ultimate endurance challenge including a team from Ireland.

Speaking to Dermot and Dave, Robbie Heffernan and Rachel Nolan from the Irish team spilled the beans on the race from the painful injuries they suffered to how the Fijian's singing Ireland's Call kept them going on the roughest days.