... Principal, Thomas Stephensand Associates, Ottawa, Canada.Anita Stewart, Ph.D., Associate Professor inResidence, University of California, San Francisco,San Francisco, California.C. Barr Taylor, ... the American Alliancefor Health, Physical Education, Recreation and Dance.William R. Harlan, M.D., Associate Director forDisease Prevention, Office of the Director, NationalInstitutes of Health, ... research and attention.Finally, physical activity is only one of many every-day behaviors that affect health. In particular, nutri-tional habits are linked to some of the same aspects of health...