Cardio zone
Cardio zone means your heart rate is 70 to 84% of its maximum. In this medium-to-high intensity
exercise zone, you're pushing yourself but not straining. Most people should target this exercise zone.
Fat Burn zone
Fat burn zone means your heart rate is 50 to 69% of its maximum. This low-to-medium intensity exercise
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.
Out of zone
You’re out of zone when your heart rate is below 50% of its maximum.Your heart rate may still be
elevated in this zone, but not enough to be considered exercise.
Custom zone
Instead of using the 3 existing zones, you can create a custom zone to target a specific heart rate.
To create a custom heart-rate zone:
1. Tap the Today tab , and tap your profile picture.
2. Tap Heart Rate Zones and enter your custom zone.
On fitbit.com, log into your dashboard and click the gear icon > Settings > Personal Info,
then enter your custom zone.
Note that on Fitbit Ionic and Fitbit Versa, the heart-rate value appears gray if your watch is searching for
a stronger reading.
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