Singletrack What the Best Ultrarunners Are Still Getting Wrong About Fueling and Hydration (Andy Blow Interview)
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Jan 27, 2026 Andy Blow, founder of Precision Fuel & Hydration and sports scientist with F1 and Porsche Human Performance Centre experience, breaks down fueling and hydration myths. He explains carbs, gut training, sweat-rate and sodium basics. He critiques current sweat tech, warns about compounded errors in multi-day races, and outlines practical race-day guardrails for crews and pacers.
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Preload Nightly With Electrolytes
- Maintain regular hydration in the 48 hours before a race; avoid massive overdrinking in the final days.
- Use an electrolyte-rich 'preload' drink the night before and 90–120 minutes before start as insurance.
Enter Hot Sections Without A Deficit
- Don't overdrink early to 'bank' hydration, but proactively replace losses before expected hot sections.
- Enter heat or hard sections without an existing fluid deficit to avoid compounding problems.
Four In-Aid Diagnostic Questions
- Use simple in-aid questions: when did you last pee, what color was it, what have you drunk and eaten, and how's your stomach?
- Combine these answers with pacing and weather inputs to decide immediate interventions.