If you are talking about manually logging the weights session, that estimates calorie burn from the parameters you input logging the session. It overrides the data that was automatically recorded. Manually logging workout is good for when you were not wearing the tracker, but it is more accurate to wear the tracker and use the exercise app to record it, which uses your actual heart rate to calculate calories.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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