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Soaring sales, wary words for toning shoes

Fitness specialists, sneaker firms debate biomechanics

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By Jenn Abelson
Globe Staff / July 23, 2010

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A little instability is creating a whole lot of cash for sneaker makers. Toning shoes — which are sneakers designed with an unstable sole so leg muscles have to work harder to maintain balance during everyday activities — are the fastest-growing segment in the footwear industry, with sales expected to jump fivefold to $1.5 billion this year. (Full article: 1238 words)

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