Jaffe is a lifelong fitness expert. Marjorie is the president and founder of Back in Shape Exercise Studio in New York City.
Jo Sgammato is a writer and journalist who writes about popular culture. She is the author of the New York Times bestsellers Dream Come True: The LeAnn Rimes Story and Keepin' It Country: The George Strait Story, and Country's Greatest Duo: The Brooks & Dunn Story and is coauthor (with Marjorie Jaffe) of The Muscle Memory Method. She divides her time between New York and Nashville. "From the Paperback edition.