80/20 ENDURANCE BLOG

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New Study Finds Most Age-Group Triathletes Are Still Stuck in the Moderate-Intensity Rut

By Matt Fitzgerald | August 9, 2021

It’s been nearly a decade since I coined the term “moderate-intensity rut” in reference to the widespread habit among recreational…

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Heart Rate Variability

By Matt Fitzgerald | July 19, 2021

There are two kinds of endurance athlete: Those who don’t know what heart rate variability (HRV) is and those who…

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