Exercise of the Week: The World’s Most Fun Ab Exercise? | Men's Health

Exercise of the Week: The World’s Most Fun Ab Exercise? | Men's Health: "The kettlebell figure 8 looks more like a kid’s game than it does a cutting-edge core exercise. But make no mistake: It’s a terrific way to train the muscles that stabilize your spine, says David Jack, director of TeamWorks Fitness in Acton, Massachusetts. And because you’re moving the weight in a figure-8 around your body, you work those core muscles from every angle."

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