title: Exercise and fitness.
authors.affiliation: a Dr Denise Simons-Morton is a postdoctoral fellow, Center for Health Promotion Research and Development , University of Texas Health Science Center , Houston .
authors.forename: D G
authors.initials: DG
authors.lastname: Simons-Morton
authors.affiliation: b Dr Bruce Simons-Morton is associate professor, department of graduate studies , School of Allied Health Sciences, University of Texas Medical Branch , Galveston .
authors.forename: B G
authors.initials: BG
authors.lastname: Simons-Morton