Nobody Can Agree on What 'Zone 2' Cardio Is
Summary
Zones are based on your heart rate, but each app has its own idea of where they start and end. That means the definition of zone 2 varies from device to device.
Description
Zones are based on your heart rate, but each app has its own idea of where they start and end. That means the definition of zone 2 varies from device to device.
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