Duane Knudson, PhD, is a professor in the department of kinesiology and an associate dean of the College of Communication and Education at California State University-Chico. A world-renowned expert on the biomechanics of tennis, stretching, and qualitative analysis, he has served several terms on the Sport Science Committee of the United States Tennis Association. He is a fellow of the American College of Sports Medicine and the American Alliance for Health, Physical Education, Recreation, and Dance (AAHPERD), and the author of "Fundamentals of Biomechanics." He lives in Chico, California. ...