With a background in climbing, mountaineering and expeditions, Sim loves getting outside and getting involved. He's completed marathons, mountain marathons, ultras, Ironman triathlons, the Endurancelife Coast to Coast Extreme and this year's Lakes Sky Ultra. Sim and wife Jen are the authors and photographers of guidebook Wild Running ; routes editors and gear gurus for Trail Running magazine; columnists for Running magazine and contributors to Trail, Country Walking and BBC Countryfile magazines. They spent 2015 living in a bell tent with their two kids, now aged 5 and 2, having awesome family adventures. Their new book is out in spring 2017.