“…Given the data obtained, we believe improving school principals’ HL is crucial for effectively implementing HPS supporting students, teaching, working conditions and principles. Simultaneously, the HL of school principals can be increased, among others, by including content related to school health promotion during school principals’ initial and in-service training [ 54 , 55 ]. It is also essential to develop a health-promoting leadership model of school managing, understood as ’[…] leadership that is concerned with creating a culture for health-promoting workplaces and values to inspire and motivate the employees to participate in such a development’ [ 56 ].…”