When you’re out of zone, which means you’re below 50% of your maximum
heart rate, your heart rate may be elevated but not enough to be considered
exercise.
Fat Burn zone, which means your heart rate is between 50% and 69% of your
maximum, is the low-to-medium intensity exercise zone and 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 zone, which means your heart rate is between 70% and 84% of your
maximum, is the 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 zone, which means your heart rate is 85% of your maximum or higher, is
the high-intensity exercise zone. Peak 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 in the
Fitbit app or fitbit.com dashboard. When you’re in that zone you’ll see a solid heart.
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.
Sleep Tracking
Wear your Blaze to bed to automatically track both your time spent asleep and your
sleep quality. To see your sleep information, sync your tracker when you wake up
and check your dashboard.
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