The Limits of Endurance: Dr. Andrew Best on Running’s “Metabolic Ceiling”
Release Date: 01/22/2026
The Strength Running Podcast
Ian Sharman is a 2x USATF 100-mile Trail Champion, 4x winner of the Leadville Trail 100, and author of the new book . He's one of the most recognizable names in the world of ultrarunning. He’s won more than 50 marathons out of over 250 he's run, ran a 2:21 marathon at age 43, holds the fastest time in a trail 100-mile race by a Brit (12h44m), and holds the record for the Grand Slam of Ultrarunning (69h49m). In this conversation, we discussed what's changed and what remains fundamental for ultramarathon training (fueling, mileage, workouts, terrain, durability, and more). Resources...
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has a Master's degree in Human Performance, writes the incredibly popular , and has recently run a 2:24 marathon. He also trains unconventionally: gone are the 100-mile weeks and in place of them are moderate mileage weeks (60-80) with 10+ hours of cycling. In this episode, we rank the core 3 performance metrics of VO2 Max, Lactate Threshold, and Running Economy and discuss how they interact with physiological resiliency, how they can be improved, and which one is the most important. Extra Resources: (one of our most popular episodes with Brady!) Thank you Previnex! Get...
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Stevie Lyn Smith is a board-certified specialist in sports dietetics, a Registered Dietitian, and an 11x Ironman competitor with an 11:35 PR. Today, we're exploring the most recent advances in sports nutrition for fueling: How many carbs are now recommended per hour of hard running? What about workouts or long runs? Is "proteinmaxxing" valuable for runners? What are its potential drawbacks? How much dehydration is acceptable before a decrease in performance is inevitable? Should every runner consider sodium bicarb for better performances? A lot more... A big thanks to Stevie for her...
info_outlineDr. Andrew Best is a professor at the Massachusetts College of Liberal Arts where he focuses on evolutionary questions about human physiology. You can email him at andrew.best@mcla.edu.
His latest study was titled “Ultra Endurance Athletes and the Metabolic Ceiling.” They looked at the maximum, sustainable amount of energy expenditure that can be done over a long time period. It answers the question, "what is the limit of human energy expenditure?"
It's a metric that literally dictates how hard you can train. If you want sustainable performance, you'll love this episode.
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