Stock Photo: Woman using an exercise ball in a gym These balls are used when exercising because their inherent instability causes more of the body´s muscles to respond to maintain balance, thus providing a better work-out

Woman using an exercise ball in a gym  These balls are used when exercising because their inherent instability causes more of the body´s muscles to respond to maintain balance, thus providing a better work-out : Stock Photo

1566-1137226 | Rights Managed
Credit: ajpfilm / age fotostock
Category: People-Lifestyle
ZA3-1791847

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Property Release: No

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