Fitbit Zip Ionic User Manual page 41

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Note that the heart-rate value appears gray if your watch is searching for a stronger
reading.
Zone Calculation
Out of Below 50%
Zone of your
maximum
heart rate
Fat Burn Between
50% and
69% of
your
maximum
heart rate
Cardio Between
70% and
84% of
your
maximum
heart rate
Peak Greater
than 85%
of your
maximum
heart rate
Description
Your heart rate may be elevated, but not
enough to be considered exercise.
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.
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.
This is a high-intensity exercise zone. This
zone is for short intense sessions that
improve performance and speed.
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