This intervention will include a range of school-, family- and community-based activities. These activities will be focused on children and their families following the ecological model proposed by Sallis et al., targeting mainly individual factors such as children's perceptions (safety perception on the way to school) and attitudes (independence or motivation to walk). A total of six 1-hour activities will be conducted at the classroom and two activities in the school neighborhood designed based on previous literature. Taken together, these activities will emphasize the benefits of active commuting to/from school and promote active commuting to/from school using phrases such as "If you rides a bike for 1.200 km, the medium number of disease days will be reduced by one" for families.Moreover, supporting information will be sent to families on four occasions during the intervention to encourage families to use active modes of commuting to/from school. The supporting information will consist of sending messages by whatsapp and advices (text and images) explaining the most important ideas related active commuting and benefits of active commuting on academic achievements and children´s mental and physical health.