Fitbit Zip Ionic Faq page 10


When you're not exercising, wear your device a finger's width above your wrist bone.

During a workout, experiment with wearing the device higher on your wrist (2 finger widths) for
an improved fit. Many exercises such as bike riding or weight lifting cause you to bend your wrist
frequently, which could interfere with the heart-rate signal if the watch is lower on your wrist.

Consider tightening your wristband before a workout and loosening it when you're done. The
wristband should be snug but not constricting (a tight wristband restricts blood flow, potentially
affecting the heart-rate signal).
What is my cardio fitness score?
Cardio fitness score, Fitbit's estimate of your VO2 Max, is an indicator of overall fitness that can help
predict performance for endurance-based activities including running, biking, and swimming (source).
For more information, see
Are the LEDs on my Fitbit device safe?
The LEDs on your device have very low power so they won't burn your skin, and they're programmed to
shut down if your device freezes or can't find a signal.
Note that the LEDs continue to flash if you turn off heart-rate tracking.
What is my cardio fitness score?