Fitbit Zip Alta HR - Default Heart-Rate Zones; Custom Heart-Rate Zones

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.
Icon Zone Calculation Description
Out of
Zone
Below 50%
of your
maximum
heart rate
Your heart rate may be elevated, but not
enough to be considered exercise.
Fat Burn Between
50% and
69% of your
maximum
heart rate
This is a low-to-medium intensity exercise
zone. This zone may be a good place to
start for those new to exercise. It's called
the Fat Burn zone because a higher
percentage of calories are burned from
fat, but the total calorie burn rate is lower.
Cardio Between
70% and
84% of your
maximum
heart rate
This is a medium-to-high intensity
exercise zone. In this zone you're pushing
yourself but not straining. For most
people this is the exercise zone to target.
Peak Greater than
85% of your
maximum
heart rate
This is a high-intensity exercise zone. This
zone is for short intense sessions that
improve performance and speed.
Custom heart-rate zones
Set a custom heart-rate zone or a custom max heart rate in the Fitbit app if you
have a specific target in mind. For example, elite athletes might have a target that
differs from the American Heart Association’s recommendations for most people.
For more information, see help.fitbit.com.
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