The main objective of this paper is to present a set of implications and proposals related to the health-related physical activity promotion in schools, from a study carried out among school adolescents (aged 12-18) of Teruel province (Spain) about their physical activity levels. The implications presented are derived from the most significant results of the study, related to the physical activity levels, either overall or by gender, age, season, day of the week and activity intensities. The paper finishes with a proposal of linked phases in the promotion process of health-related physical activity, as a previous step to the creation of a specific research field of the subject. These phases are: 1. Necesity to carry out studies to compare findings; 2. Unification of criteria to define \u201cactive\u201d and \u201cappropriate physical activity\u201d; 3. Elaboration of physical activity recommendations based on Spanish studies; 4. Development of promotion programs of health-related physical activity; and 5. Evaluation of the programs and publication of the results. The educational sector, in general, and Physical Education, particularly, play an important role throughout this process.<\/p>\n\n