21 Days of No Complaints is basically what it sounds like. You try to go 21 days without complaining- not even once. Every time you do, you switch a rubber bracelet from one wrist to the other and the day count restarts back to zero. The idea is based on a book by Will Bowen called “A Complaint-Free World,” in which he participates in this very experiment and writes about the challenges he faced and the benefits he received as a result of sticking to his goal.