Perfect Fit: Evaluation of a Virtual Coach for Smoking Cessation and Physical Activity

The intervention, delivered through a virtual coach, has a personalized duration and intensity, but will last on average 16 weeks. The intervention has three phases: preparation, execution (including \[re\]lapse) and closing. By having chat conversations with the Perfect Fit virtual coach (using the mobile application 'NiceDay'), the user will be guided through the different phases of the intervention. In each phase, the user has chat conversations with the virtual coach (e.g. about goal setting, weekly reflection) and, in addition, receives exercises and educational video material to support smoking cessation and PA promotion. Additionally, a smartwatch is used to objectively assess PA. It allows participants to monitor their PA and the data (on the number of steps) is used to give automatic, personalized PA advice to the user.