Yes, Carrie Underwood looks terrific, and she tells Self magazine that she's pretty serious about diet and exercise. But a busy superstar can’t always find a personal trainer to push her at the gym. So Carrie says she reaches for the next best thing—a deck of cards.

“I have a game I love for when I’m working out on my own,” she tells the magazine. “I take a deck of cards and assign each suit a body area—say, diamonds for arms, hearts for legs, spades for core and clubs for cardio. I split the deck in half and write down exercises for each suit, a different one for each half.”

Wha . . . ?

“So, if I flip over the six of hearts, I’ll do six squats. If the next card is ace of diamonds, that’s 14 push-ups. Sometimes I’ll make spades boxing and beat the crap out of the bag for however many punches the number on the card says.”

Oh! But that's not all.

“I make sure there’s a joker in each half—that’s a mile run on the treadmill. Then I go through the whole deck. With a 15-minute warm-up on the elliptical, it takes about an hour and a half total, but it’s fun because you've designed the workout yourself.”