Reply to post: From FitBits own site:

Got a Fitbit? Thought you were achieving your goals? Better read this

Anonymous Coward
Stop

From FitBits own site:

"With high-intensity interval training, P90X, boxing, 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 accurate heart rate reading. Note that your tracker will still provide accurate calorie burn readings during these types of exercise by analyzing your heart rate trends over the course of the workout."

https://help.fitbit.com/articles/en_US/Help_article/Heart-rate-FAQs

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