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If you're still struggling with belly bulge, it's time to stand up to flab -- literally. "Taking your ab routine off the floor works more of your core muscles because you have a greater range of motion," says Story Elizabeth Maley, creator of the Liquid Strength System class at Crunch Fitness. Plus, by supporting your body weight while maintaining your balance, you'll sculpt your muscles faster. Maley's plan takes just 20 minutes and can be done two or three times per week. Combine it with her abs-blasting cardio routine, and within three weeks your abs will be firm and fab.
Best machines (500 to 600 calories an hour): Treadmill (run/walk hills), elliptical trainer with movable handles and rowing machine. Do 10 minutes of each machine, moving quickly from one exercise to the next so your core muscles are constantly challenged.
Best classes (350 to 650 calories an hour): Indoor group cycling, kickboxing, anything core board- or Bosu-based and most dance classes.
Best outdoor activities (300 to 450 calories an hour): Tennis, kayaking, volleyball, and surfing.
Originally published in Fitness magazine, June 2005.