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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 limit the sensor’s
ability to provide a heart rate reading. 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. If your tracker does not show a heart
rate reading, try relaxing your wrist and staying still briefly (about 10 seconds),
after which you should see a heart rate reading.
Wrist choice and dominant hand
For greater accuracy, your tracker needs to know which wrist you wear it on
(right or left) and which hand you consider dominant (right or left). Your dominant
hand is the one you usually write or throw with.
During setup you’re asked to choose the wrist where you're going to wear your
tracker. Should you later decide to move your tracker to the other wrist, change the
Wrist setting. You can also change your dominant hand at any time with the
Handedness setting. Both settings are found in the Account section of the Fitbit app
or in the Personal Info section of your fitbit.com dashboard settings.
Navigation
Charge 2 has an OLED tap display and one button.
Waking a dimmed screen
When you’re not using Charge 2 the display is off. To wake it up:
•! Press the button
