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A shopper declared, "The best I have found. I have had this ball for 2.5 years now and use it regularly. It stays fully inflated (easily weeks between needing to add any air), is durable, and has the ...

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“Over there, look,” trainer Juilieanna McGuire says, pointing discreetly toward a young woman stretching her back over a large rubber exercise ball. “I used to try to correct them, but now it would be ...

Inflatable exercise balls -- used for decades in physical therapy for rehabilitating back injuries -- help build strength and improve balance by forcing the body to use more than one muscle at a time.