What the Best Ultrarunners Are Still Getting Wrong About Fueling and Hydration (Andy Blow Interview)
What the Best Ultrarunners Are Still Getting Wrong About Fueling and Hydration (Andy Blow Interview)  
Podcast: Singletrack
Published On: Tue Jan 27 2026
Description: In this episode of the Singletrack Podcast, I sit down with Andy Blow, CEO and founder of Precision Fuel & Hydration, for a wide-ranging conversation about what athletes at all levels still get wrong about fueling and hydration in ultrarunning. A note up front: Precision Fuel & Hydration is a major partner of the Singletrack Podcast — a partnership we’re proud of and want to fully disclose. That said, this conversation isn’t contractually obligated. It’s the exact discussion I would want to have with Andy regardless, driven by a growing curiosity around nutrition, technology, and performance in endurance sports.Andy brings a deep and unique background to the conversation, with a degree in Sports & Exercise Science from the University of Bath, experience working as a sports scientist with Formula 1 teams, and a role helping establish the Porsche Human Performance Centre before founding Precision Fuel & Hydration.We explore both fundamentals and frontiers, including:Why many ultrarunners — including elite athletes — succeed despite gaps in nutrition knowledgeCore hydration concepts like sweat rate, sweat sodium concentration, and blood volume contractionThe danger of chasing marginal gains before mastering the basicsWhy real-time sweat tech still isn’t quite ready for prime time “Ballpark accuracy” vs perfect precision in fueling and hydrationAid-station decision-making, guardrails, and crew strategy in ultra racesThe emerging challenges of fueling and hydrating for multi-day eventsI learned a lot in this one, and hope you do too.Partners:Norda - check out the 005: the lightest, fastest, most stable trail racing shoe ever made (https://nordarun.com/)Precision Fuel and Hydration - use code SINGLETRACK at checkout for 15% off your next order (https://www.precisionhydration.com/planner/?utm_source=partner&utm_medium=podcast&utm_campaign=singletrack)Raide - Making equipment for efficient human-powered movement in the mountains (https://raideresearch.com/)Janji - premium trail running apparel (https://janji.com/)Support the show