Mutanen, AnnikaUniversity of Helsinki--Fazeli, ElnazUniversity of Helsinki, University of TurkuPhD student, previously University teacher-Jaakonaho, IinaFinnish Meteorological Institute--Howarth, TimothyUniversity of Eastern FinlandPost-Doctoral Researcher-Songlin, YANG---Viskari, TiaFinnish Institute for Health and Welfare, Tampere UniversityVisiting Researcher, Grant Researcher, Doctoral Researcherphysical activity, mental health, school, children, adolescentsEhrlén, VeeraUniversity of Jyväskylä--Meriläinen, IikkaUniversity of OuluDoctoral Researcher, Project Researcher-Salin, KasperUniversity of JyväskyläSenior lecturerActive commuting, Fitness, Physical activity, Physical education, Sport club participation, Sport tr...Lampinen, ViliTampere UniversityDoctoral Student-