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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?

Nautilus and similar machines may have democratized strength training in the past quarter-century, making it a more…

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