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There's good news for those suffering from SSS (sudden swimsuit shyness). Even if you haven't lifted a finger (let alone a dumbbell) to prep for summer, this plan will get you bikini-ready fast. Pro beach-volleyball player Gabrielle Reece swears by it, and she spends most days in a two-piece. The secret? Efficiency. Now that she's crazy busy raising her 3-year-old daughter, Reece; running her fitness website, GoToGabby.com; promoting her new fragrance, Davidoff Cool Water Wave; and competing in a four-on-four volleyball tournament, Reece doesn't have endless hours to devote to the gym. "I've gotten smarter about my workouts," she says. "I rely on movements that target multiple muscles at once, so every second is maximized." After only three sessions of this speedy shape-up plus the cardio plan, expect slimmer, sleeker legs; a flatter tummy; sculpted arms; and uncontrollable urges to go shopping for a new (more revealing) swimsuit. Start today!

The workout

Reece's go-to guy, trainer Tim Adams, designed this 25-minute total-body turnaround. "Because each exercise recruits several muscles at once, the routine will create the greatest change possible in the least amount of time," Adams says.

What you'll need A set of 3- to 12-pound dumbbells and any type of sports ball you prefer

Try it Do two sets of 15 reps of each move three times a week on nonconsecutive days. Add cardio (see "Take Inches Off") to fast-track fat burning.