Calli Hauger-Thackery running at the Boston Marathon Image source, Boston Athletic Assocation’
Image caption,

Calli Hauger-Thackery won her first marathon - the McKirdy Micro Marathon - in New York in October 2023

BySarah Dawkins, BBC Sport senior journalist and Ailsa Cowen, BBC Sport journalist
  • Published21 April 2026

For an elite athlete who has represented Great Britain at the Olympic Games, running the Boston Marathon in two hours and 43 minutes might not seem like much of an achievement.

That is, after all, over 20 minutes slower than her personal best.