dancers are among those seeking relief by rubbing soccer-sized plastic globes into the places where it hurts. Instead of hands, the Yamuna Body Rolling workout uses balls -- of various sizes, weights and densities -- to massage those creaky bones and angry joints. In dimly-lit studios scattered over 15 countries, instructors guide students through movements designed to ease frozen shoulders and loosen stiff knees by slowly and methodically rolling out hips, torsos, sides and backs.
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