To summer-ize your waistline in record time, take this around-the-globe tour of the top tummy toners. Do two sets of each move, completing all 10 in any order to target your abs from every angle. (Or pick a few to add middle-whittling power to your regular routine.) All you'll need is a single two-pound dumbbell and a resistance band -- and a credit card for that dream bikini you'll be wearing all summer!
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