Implementation intentions have been the research focus of Peter Gollwitzer, a psychology professor at New York University. They offer a method that builds moments for your new behaviour into your daily routine, just like the cues in that Boston study. If you decide beforehand when you’re going to do something, you’re much more likely to do it. According to Gollwitzer, the best formula for implementation intentions is a conditional statement: ‘If X happens, then I will Y.’