Title: The first 20 minutes
Description: Gretchen Reynolds explains how exercise affects the body in distinct ways and provides the tools readers need to achieve their fitness goals - whether that's a faster 5K or staying trim.
Subjects: Physical education and training, Physical fitness, Exercise, Physiological aspects, Popular Works, Physiology, Physical Fitness, HEALTH & FITNESS / Healthy Living, HEALTH & FITNESS / Exercise, Reducing exercises, Health and Fitness, Exercise, physiological aspects