80/20 ENDURANCE BLOG

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Yes, But How Do You Feel? More Evidence That Subjective Training Metrics Have More Value Than Objective Metrics

By Matt Fitzgerald | March 31, 2023

Everything changed when the stethoscope was invented. Credit Rene Laennec, the 18th-Century French physician and flautist who invented this revolutionary…

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The Problem with Intensity

By Matt Fitzgerald | January 17, 2023

In endurance sports we toss around the word “intensity” as if this word had a clear, singular, and consensual definition.…

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