Dr. 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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The Limits of Endurance: Dr. Andrew Best on Running's "Metabolic Ceiling"

The Strength Running Podcast