Icon Zone Calculation Description
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.
Note that the heart-rate value appears gray if your watch is searching for a stronger
reading.
Custom heart-rate zones
Instead of using the default heart-rate zones, you can set 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 watch. 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 Association information, see help.fitbit.com.
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