title: Reflections before moving forward.
authors.forename: Harold W
authors.initials: HW
authors.lastname: Kohl
authors.forename: Jennifer M
authors.initials: JM
authors.lastname: Hootman
mesh_terms: D006293:Health Promotion; D006304:Health Status; D006801:Humans; D009043:Motor Activity / Q000502:physiology*; D010506:Periodicals as Topic / Q000639:trends*; D011643:Publishing / Q000706:statistics & numerical data* / Q000639:trends