I think the 4x4 Diet profoundly a good source to start an exercise and diet program . It emphasizes 4 key food, 4 minute workouts, and four weeks to the body you want. What more could you ask for. What really drew me to this book was the title. I'm ready to go full force with it after reviewing it over and over. It seems to be more of a life style. I really like it so far.