Discussion The present study describes the weekly time spent in specific sedentary behaviors by Japanese elementary school children. The fun families study: intervention to reduce children's TV viewing. Participation was voluntary, and the confidentiality of the participants was ensured. Furthermore, the reliability and validity of the scales used in this study are unknown as it is not reported in previous studies [ 34 ]. The present study included all students from these grades. Physical activity was also measured through the questionnaire. Sedentary behaviors in fifth-grade boys and girls: where, with whom, and why? Therefore, instructing children how to spend time when alone at home might be one effective strategy for decreasing sedentary behavior.