Barbara E. Ainsworth, PhD, MPH, FACSM, FNAK, is a professor in the Exercise and Wellness Program within the School of Nutrition and Health Promotion at Arizona State University (ASU). Her research relates to physical activity and public health with focuses on the assessment of physical activity in populations, the evaluation of physical activity questionnaires, and physical activity in women. Dr. ... Read moreAinsworth is best known as the lead author for the Compendium of Physical Activities, an exhaustive list of the energy cost of human physical activities. Dr. Ainsworth holds honorary academic appointments at the Karolinska Institute in Stockholm, Sweden, and the Akershaus University College in Oslo, Norway. She has served as president for the ACSM and was a 2006 ACSM Citation Award recipient. Her teaching assignment at ASU includes graduate courses on research methods, physical activity and public health, and physical activity epidemiology. Caroline A. Macera , PhD, FACSM, is a professor of epidemiology and associate director at the Graduate School of Public Health at San Diego State University. Dr. Macera taught at the University of South Carolina for 17 years before joining the Centers for Disease Control and Prevention as a team leader for surveillance and epidemiology in the Physical Activity and Health Branch. During this time, she was involved in developing the Healthy People 2010 physical activity and fitness objectives. Dr. Macera has more than 30 years of experience as an epidemiologist and is a fellow of the ACSM. She has more than 200 publications in the field of epidemiology and public health, most with a focus on the role of physical activity and health. Dr. Macera is a coauthor of an undergraduate text entitled, "Basics of Epidemiology: The Distribution and Determinants of Disease in Humans," and teaches courses in epidemiology and chronic disease prevention. Show Less