The “HEALTH4EUkids” Joint Action aims to implement health promotion and prevention strategies for child obesity across European countries. It seeks to share best practices and research findings, particularly focusing on the initiatives Grunau Moves from Germany and Smart Family from Finland. The project involves knowledge transfer, cooperation between member states, policy development, and the promotion of healthy lifestyles in families and communities. Its goal is to prevent childhood obesity, increase physical activity and healthy diet, and ensure the sustainability and transferability of successful practices to other member states.