1 Schools of Kinesiology and Public Health University of Michigan Ann Arbor, MI Physical Activity and Health Branch Division of Nutrition, Physical Activity and Obesity Centers for Disease Control and Prevention Atlanta, GA City College of New York New York, NY Department of Clinical Medicine College of Medicine University of Central Florida Orlando, FL Kinetics Consulting Bethesda, MD Gramercy Research Group Winston-Salem, NC Department of Exercise and Wellness School of Nutrition and Health Promotion Arizona State University Tempe, AZ Indiana University Center for Aging Research Regenstrief Institute, Inc. Indianapolis, IN.