🫀Heart Rate Zone Calculator
Heart rate training zones define intensity levels for cardio exercise. The Karvonen formula uses heart rate reserve (HRmax − resting HR) to give personalised zones more accurate than simple %HRmax methods.
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Did You Know?
Zone 2 training (comfortable aerobic pace) is where elite endurance athletes spend 70–80% of their training time — building the aerobic base that supports faster work.
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