Columns: Fitness SafetyFitness Safety Guidelines Throughout the Life SpanRahl, Riva L. M.D.Author Information Riva L. Rahl, M.D., is an internist/preventive medicine specialist and has worked at the Cooper Clinic in Dallas, TX, since 2005. She is double boarded in Internal and Emergency Medicine and author of Physical Activity and Health Guidelines (Human Kinetics, 2010). In 2019, Dr. Rahl was inducted into the Rice Athletics Hall of Fame. She is a distance runner and has placed first in numerous marathons, including the Dallas White Rock Marathon (2000) and the Cowtown Marathon (2000, 2002, and 2008). ACSM's Health & Fitness Journal: 9/10 2020 - Volume 24 - Issue 5 - p 60-62 doi: 10.1249/FIT.0000000000000601 Buy Metrics Copyright © 2020 by American College of Sports Medicine.