In the program we will perform a recreational physical activity intervention during one year that include standardized recreative and non competitive activities conducted by sports instructors

This group will not participate in the intervention

The prevalence of overweight in chilean children in the among the highest in the world and increasing quickly. The investigators recently evaluated an after-school program of recreational physical activity to control overweight, obesity and other cardiovascular risk factors in primary school children Temuco. This program reduced adiposity and increased the fitness.

By using 20-m shuttle run test, which is validated to measure maximal aerobic capacity in children from 4 years.

By using standing long jump test

By using the sit and reach test

By using 4x10 meters shuttle run test

By using the instrument for assessing Health-Related Quality of Life for children and adolescents aged 4-17 years (KINDL), in its version validated in Spanish. The KINDLR questionnaire consists of 24 Likert-scaled items associated with six dimensions: physical well-being, emotional well-being, self-esteem, family, friends and everyday functioning (school or nursery school/kindergarten). The sub-scales of these six dimensions can be combined to produce a total score. the score ranges from 0 to 100. Higher scores indicate better health-related quality of life.