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KettleBelles (KB at rdfX), is a 45-minute class using the cast-iron kettlebells. In this 45-
minute workout, Women's Health Magazine says, "Researchers found that people who did a
20-minute kettlebell workout torched almost 300 calories—and that's just for starters. When
you factor in the muscle-sculpting impact (the calories burned after you exercise as your
body repairs its muscle fibers), the total expenditure could increase by up to 50 percent.".

*Image courtesy of Women's Health Magazine.