ISBN-13: 9781492596721, 978-1492596721. NSCA’s Essentials of Personal Training Author(s): Brad J. Schoenfeld, Ronald L. Snarr, NSCA -National Strength & Conditioning Association. Developed by the National Strength and Conditioning Association (NSCA), NSCAs Essentials of Personal Training, Third Edition With HKPropel Access, is the definitive reference for personal training professionals and students.