Stability balls—also known as exercise, fitness, or Swiss balls—are a home-gym staple. But more often than not, they end up sitting useless in the corner of spare rooms, deflated in closets ...

Another company, EB Brands of Yonkers, N.Y., recalled 3 million stability balls in 2009 after receiving 47 complaints from consumers about explosions of balls marketed as "anti-burst." ...