Jisho

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Noun
1. balance ball; exercise ball; Swiss ball
Wikipedia definition
2. Exercise ballAn exercise ball is a ball constructed of soft elastic with a diameter of approximately 35 to 85 centimeters (14 to 34 inches) and filled with air. The air pressure is changed by removing a valve stem and either filling with air or letting the ball deflate. It is most often used in physical therapy, athletic training and exercise. It can also be used for weight training.
Read “Exercise ball” on English Wikipedia
Read “バランスボール” on Japanese Wikipedia
Read “Exercise ball” on DBpedia
Other forms
バランス・ボール

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