title: Physical inactivity remains the greatest public health problem of the 21st century: evidence, improved methods and solutions using the '7 investments that work' as a framework.
authors.affiliation: School of Human Movement Studies, University of Queensland,  St Lucia, Queensland, Australia.
authors.forename: Stewart G
authors.initials: SG
authors.lastname: Trost
authors.affiliation: Arnold School of Public Health, University of South Carolina, South Carolina, South Carolina, USA
authors.forename: Steven N
authors.initials: SN
authors.lastname: Blair
authors.affiliation: Department of Family Practice, The University of British Columbia, Vancouver, British Columbia, Canada;  Aspetar: Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar; karim.khan@aspetar.com
authors.forename: Karim M
authors.initials: KM
authors.lastname: Khan
mesh_terms: D003479:Curriculum; D004779:Environment Design; D015444:Exercise / Q000502:physiology; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D011634:Public Health; D012572:School Health Services; D057185:Sedentary Behavior; D013177:Sports / Q000193:education / Q000502:physiology
keywords: Physical activity and exercise methodology