The better way is not to log it after the fact. Logging is meant just for when you were not wearing the tracker. Use the exercise app with 'Weights', manually start and stop, and it does it all for you, calculating calories using heart rate. When you log an activity, that overrides everything that the tracker actually recorded.
See How do I track my workouts with my Fitbit device?
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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