This challenge has us on the edge of our seats. World champion long-distance runner Kilian Jornet and renowned BASE jumper Tom Erik Heimen are going head to head in The Romsdalshorn Challenge. They're meeting at the base of the iconic Romsdalshorn in Norway to see who can go up and back down the mountain the quickest. So who will be the winner: the runner or the BASE jumper? On your marks, get set, go!