Five schools will be randomly assigned to an intervention schools, four of them will apply a single intervention (n=50 children per intervention/school) and one school will implement the integrated program (all four interventions simultaneously;n=50 children).The sixth school will serve as a control school and will not receive any intervention (n=50 children). In schools assigned to the active PE lesson and integrated intervention, standard PE lessons will be replaced for the Active Didactics Unit. In all other schools, children will be exposed to the usual PE session's structure according to the National Education Program in Spain (i.e. 45 min sessions twice per week).