Historic Victory Despite Physical Setbacks
Blandine L'Hirondel stood at the finish line in Chamonix on Saturday, August 29, having just completed one of ultra-trail running's most demanding challenges. The 35-year-old French athlete claimed victory in the Ultra-Trail du Mont-Blanc (UTMB), becoming the first French woman to win the grueling 174-kilometer race with over 9,000 meters of elevation gain since Caroline Chaverot in 2016. She is only the fourth French woman ever to claim the title, following Karine Herry in 2006, Nathalie Mauclair in 2015, and Chaverot.
The victory came despite significant physical setbacks that had plagued her preparation. L'Hirondel entered the race weakened by injury and without specific goals, yet managed to cross the finish line in 21 hours 54 minutes and 49 seconds—the fastest time ever recorded by a woman at UTMB. However, due to course alterations caused by thunderstorms and a two-hour start delay, her time will not be recognized as an official course record.
Overcoming Arterial Endofibrosis
Speaking with Le Monde days after her triumph, L'Hirondel was candid about the struggles that preceded her victory. Her training had been severely compromised by arterial endofibrosis in her left leg, a rare vascular condition affecting approximately 0.01% of the population that primarily impacts endurance athletes. The condition, caused by fibrosis and thickening of arterial walls due to repeated mechanical stress, prevented her from completing intense training sessions.
"To be completely honest, I don't know" how the victory happened, L'Hirondel admitted. "A few weeks before the start, I was at rock bottom. My arterial endofibrosis in my left leg prevented me from doing intense training sessions, which compromised my entire preparation. I felt pain in my other leg from an injury two months earlier. Mentally, it hit me so hard that three weeks before the UTMB, I had no feeling at all. Even running 20 kilometers seemed like the end of the world."
The UTMB Challenge
The UTMB, first held in 2003, follows the route of the Tour du Mont Blanc through France, Italy, and Switzerland, tracing one of Europe's most popular long-distance walking routes. With a maximum field of around 2,300 participants and a cutoff time of approximately 46 hours and 45 minutes, the race demands exceptional endurance, navigation skills, and altitude acclimatization.
A Distinguished Career
L'Hirondel's victory adds another remarkable achievement to her already distinguished career. She also won the Diagonale des Fous on Réunion Island at the end of 2025, completing the approximately 175-kilometer course with 10,500 meters of elevation gain in 27 hours and 26 minutes, finishing eighth overall. That race, like UTMB, is one of the four major events in the UTMB World Series, which features pinnacle races across the Americas, Europe, Asia-Pacific, and Oceania regions.
With her 2026 UTMB victory, L'Hirondel became only the second woman ever to win all three major UTMB Mont-Blanc races, having previously claimed the OCC in 2021 and the CCC in 2022. New Zealand's Ruth Croft is the only other woman to achieve this feat. The accomplishment places L'Hirondel among the most successful athletes in the sport's history.
Balancing Medicine and Elite Athletics
What makes her achievements even more remarkable is that L'Hirondel maintains a full career as an obstetrician-gynecologist alongside her elite athletic pursuits. Balancing the demands of medicine with top-level ultra-trail racing, she embodies a unique combination of professional dedication and athletic excellence that few can match.
Her path from doubt to victory at UTMB demonstrates not only physical resilience but mental fortitude in overcoming significant obstacles when many athletes would have withdrawn from competition entirely.
