Concerning the health of teachers, empirical research has been conducted for a significant amount of time, which, in general, comes to the following conclusion: Teachers are a risk population in terms of mental diseases. However, applied science aiming to develop and evaluate efficient interventions leave something to be desired. Therefore the project "Healthy teaching" has been initiated. In a randomized-controlled trial, 69 teachers took part in a training on positive, health-related self-management. In groups, participants were trained over the time of four weeks. The concept of the intervention was developed from previous studies and based on findings in positive psychology. The trainings were evaluated by psychological measures (questionnaires) and biological measurement (saliva cortisol). Results show that participants significantly improved in techniques of positive psychology, health behavior and reducing dysfunctional cognition. There was a strong effect in reducing stress and a moderate effect in improving self-efficacy and optimism. Long term outcomes like depressive mood and psychosomatic complaints changed in a positive direction. A positive, health-related self-management can be concluded as a key aspect for the well-being of the teaching person. Future research should investigate the long term effect of trainings and finally concentrate on how to spread interventions throughout the schoolworld.