Essential Health Skills Third Edition Catherine A. Sanderson, PhD Professor of Psychology Amherst College Amherst, Massachusetts Mark Zelman, PhD Professor of Biology Aurora University Aurora, Illinois Publisher The Goodheart-Willcox Company, Inc. Tinley Park, Illinois www.g-w.com Pedagogy Developers Diane Farthing, NBCT Health Educator Pleasanton, California Melanie Lynch, M.Ed. Health Education Specialist Pittsburgh, Pennsylvania Melissa Munsell Instructional Specialist Physical Education and Health Department San Antonio, Texas