Swiss ball

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An air-filled ball constructed of elastic PVC which measure 35 to 85 cm (14 to 34 inches) which is used in physical therapy, athletic training, exercise and as an assistive device for weight training.

Swiss ball

An inflatable vinyl or rubber ball, used in exercise training, rehabilitation, and sports to treat low back pain or to strengthen the muscles of the abdomen and chest. Synonym: balance ball; fitness ball; stability ball
See also: ball