The main objective of the  ACTIBESE project is to determine the school, interpersonal and personal factors that influence the active behavior of schoolchildren, using the socioecological theory as a model of interaction in physical education and health. The methodology consists of a cross-sectional study and intervention in twelve schools in Viña del Mar, Los Andes and Temuco. In the cross-sectional study, 405 schoolchildren, 405 parents and 18 teachers will participate. In the intervention, a five-month continuous training will be applied to teachers to improve their teaching style and promote self-education.