User manual

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2. Do not wear your tracker too tight; a tight band restricts blood flow,
potentially affecting the heart rate signal. That being said, the tracker should
also be slightly tighter (snug but not constricting) during exercise than during
all-day wear.
3. With high-intensity interval training or other activities where your wrist is
moving vigorously and non-rhythmically, the movement may prevent the
sensor from finding an accurate heart rate. Similarly, with exercises such as
weight lifting or rowing, your wrist muscles may flex in such a way that the
band tightens and loosens during exercise. Try relaxing your wrist and staying
still briefly (about 10 seconds), after which you should see an improved heart
rate reading.
Dominant or non-dominant wrist
For greater accuracy, your tracker needs to know which wrist you wear it on. Your
non-dominant wrist is the default. If you wear your tracker on your dominant wrist
instead (meaning, the hand you write with), you can adjust the setting in the Account
section of the Fitbit app or in the Devices section of your fitbit.com dashboard
settings.
Navigation
The Blaze has a touch screen with a colored LCD and three buttons: Action, Select,
and Back.