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If you are gifting it to them all they need to do is set it up with their own email address and it will start over for them
Make sure to sync one last time and remove it from your Bluetooth settings before turning it over
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@SunsetRunner Welcome to the Fitbit family! Thanks for posting your inquiry about giving your One to another user.
Yes, just as @WendyB said, all he needs to do is set up the One to his own account and he will start using your One. Sync before doing this for your data to be saved on your account.
You can then remove your One from your account and give it away. To remove it from your account:
- Open the Fitbit app.
- Tap your tracker tile (image of your tracker at the top right corner of the app).
- Tap the trash can icon at the top right corner.
Then, it will be ready to be given to another user. Tell the user to follow these set up steps on his account.
Hope this helps. Keep me posted! 
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