The Sasakawa Sports Foundation (Minato-ku, Tokyo, Chairman: Kazutoshi Watanabe, hereinafter SSF), which promotes "Sports for All," conducted the "Survey on Children's Physical Activity and Play in the Era of Climate Change" (Survey Period: September 2025 - February 2026) in collaboration with Associate Professor Tetsuhiko Kidokoro of the Faculty of Health and Sport Sciences, Nippon Sport Science University. Children's lack of physical activity is a social issue related to the healthy growth of mind and body. In recent years, with continuous extreme heat, attention has also been focused on the effects of temperature and climate, particularly heat countermeasures. However, no nationwide survey has been conducted on the impact of seasons on children's physical activity. This survey was conducted three times in September 2025, November 2025, and February 2026. Using longitudinal data from 2,605 elementary school students nationwide, whose guardians responded to all surveys, the impact of seasons on physical activity was analyzed. Children who did not meet the physical activity amount recommended by the World Health Organization (WHO) (60 minutes per day) (hereinafter, physical activity guidelines) accounted for 70-80% at all survey points, revealing chronic physical inactivity regardless of the season. Official Website Key Survey Findings ● 72-80% of children did not meet the physical activity guidelines at all survey points; no seasonal impact on achievement rates was observed. ● Approximately 60% of children never met the physical activity guidelines throughout the three surveys. ● The top reasons for inactivity among those who did not meet the guidelines were "no particular reason," "have other things I want to do," and "lack of time." ● The biggest reason for inactivity among those who did not meet the guidelines during summer (September survey) was "heat." Comment from Associate Professor Tetsuhiko Kidokoro (Faculty of Health and Sport Sciences, Nippon Sport Scienc