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80/20 Endurance

Training intensity and zones

Intensity is the one variable that separates 80/20 training from what most endurance athletes do by default. These articles cover how to measure it, by heart rate, pace, power or feel, how to test your threshold without a lab, and how to set zones you can trust for running, cycling and swimming. Start with the zone calculator and the intensity guidelines for your sport, then read on for why the moderate zone is where most training goes wrong.

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