<< Objectives >>The main goal of TOOL4CHILDREN is to contribute, in cooperation with the partner, to develop an app to promote physical activity in order to change the attitudes of 11-17 year olds towards physical and mental health and to develop the right skills for a healthy lifestyle.The need for the project was driven by the low physical activity levels and poor mental health of school-age children.The project will contribute to improving the academic, emotional, behavioral, health of target group.<< Implementation >>The main activities:1. Project management and implementation; 2. Developing a physical activity app;3. Organizing transnational project meetings; 4. Dissemination and sustainability.<< Results >>A physical activity app has been developed to help bring together like-minded people who want to exercise in their neighborhood, promote the use of technology for health, increase physical activity, and to foster cooperation between different social groups. All the materials and tools created within the project will be made available to the bigger public after the conclusion of the project, in order to contribute to obesity across Europe.