Avery D. Faigenbaum, EdD, CSCS, is a professor in the department of health and exercise science at the College of New Jersey. Dr. Faigenbaum is a leading researcher and practitioner in pediatric exercise science, with nearly 20 years of experience in working with children and adolescents. He has authored more than 100 scientific articles, 20 book chapters, and 7 books related to youth fitness and conditioning. In addition, Dr. Faigenbaum has lectured nationally and internationally to health and fitness organizations and has developed youth fitness programs for YMCAs, recreation centers, physical education classes, and after-school sport programs.Dr. Faigenbaum is a fellow of the American College of Sports Medicine and of the National Strength and Conditioning Association. He is also a member of the International Scientific Advisory Committee and was a member of the Massachusetts Governor's Council on Physical Fitness and Sports for 7 years.Wayne L. Westcott, PhD, CSCS, is a fitness research director at the South Shore YMCA and adjunct professor of exercise science at Quincy College, both in Quincy, Massachusetts. He has served as a strength-training consultant for Nautilus, the United States Navy, the American Council on Exercise, the President's Council on Physical Fitness and Sports, and the YMCA of the USA. He has also been an editorial advisor for many publications, including Physician and Sportsmedicine, Fitness Management, On-Site Fitness, Prevention, Shape, and Men's Health. He has authored or coauthored 23 books on youth strength training worldwide and has helped numerous colleges, schools, YMCAs, and fitness centers develop youth strength-training programs.