A pilot training course on school health promotion in Austria focused on supporting teachers and school heads during the implementation of the health-promoting school (HPS) concept. The participants talked about their experiences during the implementation phase in focus groups held in a feedback seminar at the end of the training course. The focus groups were analyzed by using an inductive approach. A coding method for thematic analysis was applied. Compatibility of the training course with the school setting was examined and supporting and hindering structures and processes pertaining to the schools and the training course are described. The results can be displayed in a model showing connections between the themes. Internal and external collaboration structures were identified as central aspects in the implementation phase. Particularly collaboration within the faculty is shown to be of importance when implementing the HPS approach. Voluntary cooperation especially of teachers, which is often connected with work in their spare time, is another aspect influencing the sustain-ability and therefore also the compatibility of the training course with the school setting. For future designs of teacher training courses in health promotion, the aspects of collaboration, teamwork, and collective commitment have to be taken into consideration.