Complaint-Free Day
Three days without complaining out loud about anything you cannot change.
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Why this one
Harder than it sounds, and the first day tells you something about your default setting.
The rule
Three days without complaining out loud about anything you cannot change. For 3 days. That is the whole thing; there is nothing to sign up for and nobody is tracking you.
Post the card on day one so somebody knows you started. That
is the only accountability mechanism that reliably works and it is free.