The Ultra-Trail du Mont-Blanc (UTMB) is the world’s most famous ultra-distance trail running race. Last year Lithuanian soldier Gediminas Grinius toed the start line in Chamonix, France, an unknown debutant. Just 21hrs 50mins later he returned in fifth place having crushed the brutal 168km mountain course, which includes a mammoth 9,600m elevation gain. Now one of the world’s best ultra runners and backed by a 2015 season stacked with impressive results, Gediminas goes into next week’s UTMB as a serious podium contender. He has compiled his top-10 tips on running the UTMB.