Mark Fenton is the internationally recognized host of PBS's America's Walking. A former U.S. national racewalking champion and editor-at-large of Walking magazine, he is the author of The Complete Guide to Walking for Health, Weight Loss, and Fitness...

Andrew Weil, MD, is a world-renowned leader and pioneer in the field of integrative medicine, a healing-oriented approach to health care which encompasses body, mind, and spirit. He is founder and director of the Arizona Center for Integrative Medicine (AzCIM)...