User manual
Table Of Contents
- Getting Started
- Set up Fitbit Charge 3
- Wear Charge 3
- Change the wristband
- Basics
- Notifications
- Timekeeping
- Activity and Sleep
- Fitness and Exercise
- Weather
- Restart, Erase, and Update
- Troubleshooting
- General Info and Specifications
- Regulatory & Safety Notices
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
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.
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