
Human Performance Outliers Podcast with Zach Bitter Episode 465: Leadville 100 CR & 50 Mile World Record | Anne Flower
Nov 21, 2025
Anne Flower, an emergency medicine physician and elite ultrarunner, shares her thrilling journey of breaking the Leadville 100 and 50-mile world records. She discusses her unique training methods that blend speed work with intuition, ensuring she maintains consistent low-6 minute miles during races. Balancing her medical career with running, Anne reveals how the unpredictability of the ER enhances her race-day resilience. She also touches on her fueling strategies, choice of shoes, and future race aspirations while highlighting her commitment to giving back through sponsorships.
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Mountain Volume Built Leadville Fitness
- Anne Flower links mountain training volume with her Leadville success because summer in Colorado naturally produced long days on foot.
- She credits that consistent mountain time for making Leadville a logical target and surprising strong performance.
Start At A Pace You Can Sustain
- Aim to run opening miles at a pace that feels sustainable rather than matching others' tempo.
- Use early race kilometers to decide whether to draft or run your own race plan based on comfort.
Plan Fuel By Aid Access
- Plan fueling around aid access and aim for consistent carbohydrate intake (Anne used ~75 g/hr).
- Combine gels and liquid calories and cue pickups every crew/aid visit to hit targets reliably.



