Check Out the Diet Secrets of Carrie Underwood

DIET: The vegetarian uses a food journal to keep track of her daily menu (fave foods include black beans and veggie burgers) and makes it a point not to splurge on late-night food.

EXERCISE: When she's in Ottawa, the singer will circuit train with pro Tony Greco, but while on tour she squeezes in hikes, Krav Maga classes and does 90-minute cardio, yoga and strength-training sessions with pro Eve Overland.