been attempted before. so this is our cabin. there's just enough legroom to be able to lie down. and i'm here, martin's here, so it's pretty cosy. it's the idea of katherine wilkins, who runs a fitness centre in northumberland. despite the mammoth challenge ahead, she managed to get martin, who works for her, on board. i like to try things that no—one's ever done before. when katherine mentioned it to me, that she's got this challenge in mind and no—one's ever completed it, i was instantly, "yes, i'm there, i'm doing it. the pair will start their challenge by climbing mount snowdon in wales before walking to caernarfon. they'll then row to whitehaven, and from there walk up to the summit of scafell pike. after walking back to the coast, they'll cross the irish sea to northern ireland, where they'll tackle slieve donard. they'll then take on the longest rowing leg of their expedition, by sea and canal to fort william in the highlands of scotland. there, they'll climb ben nevis. the irish sea has a lot of challenges.