Winter Challenges
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Winter Challenge Heart Rate Calculators
5-Zone (Polar) Heart Rate Calculator
Enter your age
Calculate
Known Max Heart Rate Zones Calculator
Enter your Known Max Heart Rate
Calculate
LTHR-Based Heart Rate Zones Calculator
Enter your LTHR (Lactate Threshold Heart Rate)
Calculate
80/20 LTHR-Based Heart Rate Zones Calculator
Enter your LTHR (Lactate Threshold Heart Rate)
Calculate
Friel LTHR-Based Heart Rate Zones Calculator
Enter your LTHR (Lactate Threshold Heart Rate)
Calculate