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Don’t wear your watch too tight; a tight band restricts blood flow, potentially affecting the heart-
rate signal. However, the watch should be slightly tighter (snug but not constricting) during
exercise than during all-day wear.
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. If
your watch doesn’t show a heart-rate reading, try relaxing your wrist and staying still briefly
(about 10 seconds). Then you should see a heart-rate reading.
Wrist
For greater accuracy and ease of use, FB504 & FB505 needs to know if you wear it on your dominant or
non-dominant hand. Your dominant hand is the one you use for writing and eating. If you decide to move
FB504 & FB505 to the other wrist, change the Wrist setting in the Fitbit app.
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