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exergue
exert
exertion
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exercise ball
ex·er·cise ball (plural ex·er·cise balls)


noun 
Definition:
 
ball used for exercising: a large inflated ball used in exercises to strengthen muscles and improve flexibility and balance
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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