Elsey Davis, 36, a professional trail runner and GP, calculates she will run about 400 miles and tackle more than 18,000 metres of elevation – the equivalent of two Mount Everests. The hope is to do it in less than seven days but I don’t know how I’m going to feel having never been in that position before. Photograph: family handoutDavis will set off from Land’s End and head east along the rugged north coast of Cornwall. Because that’s the strongest force that’s going to get you around. Doing it for my mum is definitely going to be the biggest thing that’s going to drive me forward,” she said.