FeaturesIntroduction to High-Intensity Interval Training and Chronic DiseasesFountaine, Charles J. Ph.D., FACSMAuthor Information Charles J. Fountaine, Ph.D., FACSM,is a professor and the program coordinator of the Exercise and Rehabilitation Sciences major at the University of Minnesota Duluth. Dr. Fountaine teaches courses in research methods and the science of resistance training. He has served as executive director for the Northland ACSM Regional Chapter since 2018 and was an associate editor for the 11th edition of ACSM’s Guidelines for Exercise Testing & Prescription. Disclosure:The author declares no conflict of interest and does not have any financial disclosures. ACSM's Health & Fitness Journal: 9/10 2021 - Volume 25 - Issue 5 - p 11-12 doi: 10.1249/FIT.0000000000000707 Buy Metrics Abstract Apply It! From this article, the reader will be introduced to this specially themed issue of ACSM’s Health & Fitness Journal® on high intensity interval training and chronic disease. The reader also will be made aware of the terms and definitions used throughout this themed issue. Copyright © 2021 by American College of Sports Medicine.