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Do you mean reset the counts to zero for today or do you mean delete all your data since you started with fitbit?
If you just want to reset for today then I'm afraid you can't but they automatically reset to zero every night at midnight.
If you want to completely start again then the easiest way is to set up a new fitbit account but this will mean using a different email. If you want to reuse your current account then you need to contact customer support.
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