Sometimes the best interventions are the ones that we do not even notice - they fit so seamlessly with our daily habits and actions -we adopt them without a second thought. As a community it is easiest for us to stay active if it is naturally built into our daily life. Let's take taking the stairs instead of an elevator or escalator. If the stairs are (A) the more obvious option and the elevators are tucked away, or (B) the stairs are presented as a game or fun challenges for people to interact with - they are more likely to make a habit of taking the stairs rather than standing on the elevator. Watch the Video of how the "The Fun Theory" changed peoples behavior in a subway station to take the stairs more often. There have been many different versions of this idea - encouraging people to take the stairs by labeling every step with a calorie lost, etc.