Target Heart Rate Calculator
5 heart rate training zones from age and resting HR.
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Training zones (Karvonen method)
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Heart rate training zones
Zone 2 (60–70%) builds aerobic base. Zone 3–4 (70–90%) improves cardiovascular fitness. Zone 5 (90–100%) develops peak power. Most endurance athletes benefit from 80% of training in zones 1–2 (polarized training).