title: Physical activity and public health: the challenges ahead.
authors.forename: Loretta
authors.initials: L
authors.lastname: DiPietro
mesh_terms: D006293:Health Promotion / Q000379:methods*; D006801:Humans; D009043:Motor Activity / Q000502:physiology*; D011634:Public Health / Q000639:trends*; D040241:Social Marketing