Asker grew up as a cyclist after trying football and white water kayaking. He then got hooked on triathlon at an early age and although he has moved up a few age groups since then he is still a keen triathlete today. Asker competed in several Ironman distance triathlons (21 in total as of January 2015), including 6 times the World Championship Ironman in Hawaii (2006-2011). He was the National Champion duathlon in his age group in 2006, won the hilly offroad Golden Gate Headlands Marathon in 2006 (3:22:48) and competed at European and World Championships duathlons. In 2013 he ran 3 of the Major marathons (Boston, Berlin and New York) and finished all of them between 3:07 and 3:09.