In the frame of FitCity, I presented a seminar on the most common design strategies for behavioural change toward an active lifestyle. These design strategies are based on classic psychological theories, such as Goal-Setting theory , Transtheoretical Model of Behavior Change, Presentation of Self in Everyday Life, Cognitive Dissonance. In the seminar, I also reviewed some relevant studies that employed persuasive strategies through artefacts and technology for fostering an active lifestyle.