This study focuses on how fitness technology services can be designed in order to support the co-creation of motivation to sustain a healthy behavior. The study used an exploratory qualitative design in which we interviewed eight seasoned runners about their running routines and their use of fitness trackers. The result shows that the fitness routines require careful planning and deliberation, and that the maintenance of a healthy lifestyle relies more on what happens between the activities than during said activity. Thus, fitness trackers should focus on feedback that allows users to co-create motivation during intermissions between health promoting behaviors.