The fitness expert who has helped Oprah lose weight and get into shape shares his secrets for how to become even more fit and healthy in all aspects of life, from diet to exercise to staying motivated.

Bob Greene is an exercise physiologist and certified personal trainer specializing in fitness, metabolism, and weight loss. He is the bestselling author of The Best Life Diet, The Total Body Makeover, Get With the Program!, and the coauthor of Make the Connection. He is also a contributing writer and editor for O the Oprah magazine and writes articles on health and fitness for Oprah.com.