Friel's 20-minute threshold method, Seiler's three-zone model, and why the grey zone 3 is the amateur trap — plus how group rides break a clean zone 2 week.
32:55 ·
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Friel's 20-minute threshold method, Seiler's three-zone model, and why the grey zone 3 is the amateur trap — plus how group rides break a clean zone 2 week.
32:55 ·