Mark Threlfall

Middle distance ex-pro with a penchant for setting triathlon swim records

Ex-professional triathlete Mark started his sporting life in the pool, competing nationally as a swimmer from age 11. After years of being roped in to school running races, where he proved successful, he gave cycling a go and had soon put all three sports together to conquer triathlon.

In 2006, Mark was selected for the World Class Programme for Great Britain and competed at a number of World and European Championships, picking up a silver at the European Duathlon Championships. Mark later moved to middle distance where he made the podium in his first year as a pro, before breaking the course record at the Outlaw Half in 2017.

With his professional and coaching experience, plus bags of enthusiasm, Mark loves to share his tips for triathlon success alongside the rookie mistakes he’s made - so you can learn from them, not repeat them.