 The objective of the study is to evaluate the effects of Program SI! for Elementary in different times of exposure for childrens and their immediate environment teachers and parents. For this purpose, 48 public schools from the Community of Madrid-South Area Spain were randomly assigned to Program SI! during 3 or 6 academic years intervention group or keep their normal curriculum control group. The main outcome is 3-year, and 6-year changes from baseline of questionnaire scoring of children, their parents and teachers in regards to a healthy lifestyle. For children were included 3-year, and 6-year changes of cardiovascular markers derived from blood pressure and anthropometry. 