The Wenatchee World

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Fitness corner

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You may have noticed it on the fringes of your gym: the trainer coaxing a client to stand on a squishy Bosu ball while simultaneously lifting dumbbells; or, back on terra firma, the muscly type who's not just lifting a sizable amount of weight but kind of jumping and shrugging to heave it from the floor to shoulder level or higher.

What gives?

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