British runner Jasmin Paris made history in 2024 by completing the Barkley Marathons, a 100-mile race with a 60-hour cut-off, finishing with just one minute 39 seconds to spare. She joined a growing list of women excelling in ultra-endurance events. Last summer, Rachel Entrekin won the Cocodona 250 in Arizona, and Sophie Woods smashed the Via Alpina record by six days despite wildfires and horsefly swarms. Yngvild Kaspersen won the Ultra-Trail Mont Blanc CCC race twice, crediting mental strength and community camaraderie.

Scientists remain cautious. Professor Andrew Jones, who worked on Eliud Kipchoge's sub-two-hour marathon, says research on ultra-endurance is "behind" shorter distances. Dr Richard Burden of the UK Sports Institute notes physiological adaptations in women may favor ultra-events but require more study.

Athletes emphasize psychology. Woods highlights adaptation and perseverance when things go wrong. Kaspersen points to mental preparation and a supportive female community that pushes competitors to improve. As more women enter these races, records continue to fall, suggesting a shift in the ultra-running landscape.