The **Essentials of Strength Training and Conditioning, Fourth Edition** is a key textbook for strength and conditioning professionals, designed to help students and practitioners deepen their knowledge and skills. Developed by the National Strength and Conditioning Association (NSCA), this edition is updated with the latest research and trends, making it an indispensable resource for those preparing for the Certified Strength and Conditioning Specialist (CSCS) exam. The book covers the scientific principles of strength training, provides practical applications for athletic performance, and offers a wealth of new features, including online videos demonstrating proper exercise form, updated research on topics like nutrition, agility, and overtraining, and expanded testing protocols. Additionally, this edition includes hands-on exercises, training drills, and access to HKPropel for enhanced learning. With its comprehensive approach, the text equips readers with everything needed to succeed in the field, from theory to program design to facility management.