The 4 x 4 DietBy: Erin Oprea Discover the 4 key foods and the 4 minute workouts that will change the way you look and feel in just 4 weeks. Celebrity trainer and former marine Erin Oprea's motto is "lean and clean." Her unique 4 x 4 diet shows you how to get clean by reducing the 4 major hitches in most diets: sugar, starch, sodium, and alcohol. She also tells you how to get lean, using her 4 minute tabata workouts: 8 repititions of 20 seconds of high intensity