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heart-rate zone on your tracker during exercise. Inspire 3 notifies you when you
enter a heart-rate zone.
Heart-rate zones help you target the training intensity of your choice. Three zones
based on American Heart Association recommendations are available, or you can
create a custom zone if you have a specific heart rate you're targeting.
Default heart-rate zones
Default heart-rate zones are calculated using your estimated maximum heart rate.
Fitbit calculates your maximum heart rate with the common formula of 220 minus
your age.
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