User Manual

Icon Zone Calculation Description
maximum
heart rate
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
Instead of using the default heart-rate zones, you can configure a custom zone or a
custom max heart rate 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 the average person. When you’re in your custom zone you’ll
see a solid heart on your tracker. When you’re not in the zone you’ll see an outline
of a heart.
For more details about heart rate tracking, including links to relevant American
Heart Rate Association information, see help.fitbit.com.
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