The media mogul worked closely with trainer Bob Greene to shed the pounds and maintain her slimmer physique. The fitness guru told Shape of her weight loss regimen, which included a three-pronged approach including nutrition, exercise, and sleep. "You have to get moving -- no excuses!" he told the fitness mag, while sharing another big secret to weight loss: Sleep. "You're less likely to make it to that morning workout if you spent the night tossing and turning," Greene shared, "and lack of a good night's sleep can even cause you to gain weight."