@PatsyWatsy It's nice to see you in the Fitbit Community.
The exercise will show fat burn zone which is between 40% and 59% of your heart rate reserve. In the fat burn zone, you’re likely in a moderate activity such as a brisk walk. Your heart rate and breathing might be elevated, but you can still carry on a conversation.
As with all heart-rate tracking technology, accuracy is affected by personal physiology, device location on your arm, and type of movement.
For a more accurate heart-rate reading:
- Wear your Fitbit device on top of your wrist, and make sure the back of the device is in contact with your skin.
- When you’re not exercising, wear your device a finger’s width above your wrist bone.
- During exercise, wear your device a bit tighter and higher for an improved fit. The band should be snug but not constricting (a tight band restricts blood flow, potentially affecting the heart-rate signal). 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.
Let me know how it goes. I'll be around if you have any additional questions.
Want to get more active? Visit Get Moving in the Lifestyle Discussion Forum.
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