doping Researchers have been quietly collecting urine samples at ultramarathons to study drug use – here's what they found The purpose of the study was to compare the methods of sampling against questionnaires to gather data “I’m utterly bewildered" – trail running world champ denies doping allegations after positive test Norway's Stian Angermund says he has no idea how he could have tested positive for banned substances Advnture NewsletterAll the latest inspiration, tips and guides to help you plan your next Advnture!Contact me with news and offers from other Future brandsReceive email from us on behalf of our trusted partners or sponsors MOST READ1The 9 weirdest events at the 2024 Olympics2Asics launch 3D-printed insoles personalized for individual foot shapes at new French studio3Watch crazy base jumper go on an Aladdin-style magic carpet ride4The Hoka Tecton X 3 is almost here and with these upgrades it looks built for speed and distance on the toughest trails5Cyclist "swung as hard as he could" and punched grizzly bear in the face – it worked