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Did you get more than you were suppose to?
You can enter a driving record and it will get rid of them.
https://help.fitbit.com/articles/en_US/Help_article/Can-I-delete-data
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Hope you're having an awesome day @Schoony! You can try the steps that @WendyB suggest to get rid of steps and calories tracked from from activities, you will find more details on how to it at the end of this master post. Note that stair will remain on the account, but your watch will reset that information from the screen at midnight. 
I wanted to add that you'll see always an amount of calories on your tracker since your Account takes your BMR (Basal Metabolic Rate) in order to calculate the calories that you're have burned throughout the first hours of morning. 
Is this the information you're looking for? Let me know if you need more help! 
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