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80/20 Endurance

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Training science, coaching, and the 80/20 method — from Matt Fitzgerald and the 80/20 Endurance coaching team.

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

    It’s been nearly a decade since I coined the term “moderate-intensity rut” in reference to the widespread habit among recreational endurance athletes of doing a plurality of their training at moderate intensity. At that time, very few athletes were even aware of the existence of the problem. But much has changed since then. The books…

    Matt Fitzgerald ·

  • Is It a Real Problem or a Measurement Problem?

    A few months ago, “Kevin” posted a concern about his training in the 80/20 discussion forum. He explained that lately his heart rate had seemed rather high relative to his pace, and the VO2max estimates he got from his watch had dipped slightly. A newer runner, Kevin was becoming discouraged and beginning to doubt the…

    Matt Fitzgerald ·

  • Leo Tolstoy: Honorary Endurance Coach

    “Happy families are all alike; every unhappy family is unhappy in its own way.” Leo Tolstoy, Anna Karenina Inspiration can come from unexpected authority. My progress as an endurance coach is nothing extraordinary: a mix of formal and informal education with a reasonable amount of experience and luck. Occasionally, my coaching philosophy is disproportionally shaped…

    Matt Fitzgerald ·

  • Do You Suffer from Workout Myopia?

    German-born Canadian spiritual teacher Eckhart Tolle’s The Power of Now has sold more than three million copies. I know this because it says so right on the cover. In the book, Tolle encourages readers to “Realize deeply that the present moment is all you ever have.” If this advice sounds familiar, it’s because it is.…

    Matt Fitzgerald ·

  • Heart Rate Variability

    There are two kinds of endurance athlete: Those who don’t know what heart rate variability (HRV) is and those who are about to find out. For as long as hearts have existed, these vital organs have contracted at a slightly erratic tempo, and it is this slight play in rhythm that we measure as HRV.…

    Matt Fitzgerald ·

  • On the Importance of “Doing You” As an Athlete

    Every once in a while a podcast host will ask me to name my favorite writer or to recommend a book to listeners. It’s always an awkward moment for me because it all but forces me to admit that I don’t read many books about endurance sports. Almost none, in fact. To be clear, I…

    Matt Fitzgerald ·

  • Avoid Bonking and GI Issues in Your Next Ultra by Guzzling Carbs

    I’ve been rubbernecking lately at a Twitter debate between scientific experts on human metabolism and obesity, on one side, and keto diet advocates on the other. The spectacle is both entertaining and tedious, and also revealing. What I’ve realized in observing it is that even I knew nothing about human metabolism and obesity, I would…

    Matt Fitzgerald ·

  • You Don’t Have to Be an Elite Runner to Run Doubles!

    The short version. Running doubles, two sessions in one day, is not only for elites. Fix your intensity balance first, so that about 80 percent of your running is easy. Then lengthen your daily runs to about an hour. Only then add doubles, and make every added session easy and fairly short. Two hours split…

    Matt Fitzgerald ·

  • Knowledge Is Good. Understanding Is Better.

    Wisdom is the principle thing; therefore get wisdom: and with all thy getting, get understanding.–Proverbs 4:7 The best teacher I ever had was Mark Gould, a sociology professor at Haverford College. I’ll never forget the first meeting of his Foundations of Social Theory class in the fall of 1989. The bearded professor (whose sundry idiosyncrasies…

    Matt Fitzgerald ·

  • The Case for Pragmatism in Endurance Training

    Among the first books I read after graduating from college (and thereby gaining the freedom to create my own syllabus) was Richard Rorty’s Truth and Progress. It served as my introduction to pragmatic philosophy, and I liked it. According to the Stanford Encyclopedia of Philosophy, “Pragmatism is a philosophical tradition that—very broadly—understands knowing the world…

    Matt Fitzgerald ·