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There's one cool tool you could be using to fight flab all over, but chances are you're not. "The stability ball is an underrated piece of equipment because people think it's good only for doing crunches," says Nedra Lopez, a coowner of Studio by Remorca Fitness in New York City. Try her game-changing toners on the next page and you'll be so pumped at the results that you may never hit the mat again.