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Flat abs and killer confidence have one thing in common: a hard core. That's because the muscles that make up your middle dictate not only how you rock a sports bra but also whether you stand tall and pack a punch in kickboxing class. "Firming the deep ab muscles is the fastest way to shrink your waist and improve your posture," says Alexandra White, a co-owner of Jumping Frog Pilates in Tenafly, New Jersey, who supplied the six turbo toners on the next page. Grab a yoga mat and do the circuit twice, three days a week on alternating days. Then flash that superfly center!