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Duhigg's core idea is the role of the three-step "habit loop." The first step is a cue--some "trigger that tells your brain to go into automatic mode and which habit to use," according to Duhigg. Step two is the routine, "which can be physical or mental or emotional." Finally, there is a reward, which helps your brain figure out if this particular loop is "worth remembering for the future." Repetition reinforces this loop until over time it becomes automatic.