Contributors from epidemiology, exercise science, and other areas in medicine and biology examine the health benefits of physical activity and public policy on promoting it. Among the topics are physiological adaptations to moderate-to-intense aerobic exercise, physical activity in the treatment of chronic conditions, obesity, national guidelines for physical activity, supports in the built environment for walking, and physical activity promotion in worksites. Annotation �穢2012 Book News, Inc., Portland, OR (booknews.com)