For decades, endurance performance has been defined by VO₂max, lactate threshold, and efficiency, but there’s a fourth variable that often gets overlooked called durability. This episode breaks down what durability actually is, why athletes with similar fitness can perform very differently late in races, and how to measure it through real-world data like heart rate drift. We also cover how to build durability through training, so you can maintain your performance when fatigue starts to take over.

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HOST

Cliff Pittman is the Coaching Development Director at CTS, leading the Ultrarunning and Cycling Coaching staff with a specialty in guiding athletes from first-time ultrarunners to elite competitors at races like Western States 100, Leadville 100, and the Triple Crown of 200s. A competitive trail and ultra athlete himself, Cliff brings firsthand experience and a rare ability to turn complex training science into simple, actionable coaching.

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Resources:

• https://onlinelibrary.wiley.com/doi/10.1002/ejsc.70073