<p>Objective: We introduced the physical activity promotion project "Fujisawa +10" and aimed to provide reference information regarding evaluation methods and research findings translating to health education and promotion.</p><p>Contents: We conducted a community-wide intervention to promote physical activity based on the Japanese physical activity guideline (Active Guide) in cooperation with Fujisawa city. The intervention's key message was "Plus Ten (+10: be active for 10 more minutes than now). We implemented this project in 4 districts for 2 years from 2013, and evaluated its pre- and post-implementation effects using population-based surveys (Phase 1). The RE-AIM evaluation revealed a low degree of reaching residents and improved active guide knowledge, but unchanged physical activity levels. From 2015, we applied it to all districts, considering the Phase 1 results (Phase 2). We aimed to improve the degree of reach and focused on group exercise interventions intended to spread to residents. Elderly individuals who performed the group exercise showed improved physical fitness one year later and consistent physical activity and cognitive function. Then, the number of participants increased by 21% in a year. We extracted features of rules, roles, and tools as important aspects of smooth group activities, and created manuals. These findings are still utilized in Fujisawa city health promotion.</p><p>Conclusion: This project involved RE-AIM evaluations and strategy improvement. Our findings were translated into the city's policy and scaled up. In Japan, in addition to increases in the practices, it is necessary to further disseminate and implement evaluation frameworks such as the RE-AIM model.</p>