If our attempts to create this habit don’t work, we will troubleshoot, starting with the prompt. And we won’t blame ourselves for lack of motivation or willpower. What we are doing is all about design—and redesign. If we need to tap into willpower, we are doing it wrong. If we revise the prompt and make the behavior as simple as possible, and we still don’t succeed, we’ll back up and pick a different behavior—one that we actually want to do.