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QUESTION, what do you call those things , the "tiny bosu balls" if you will. You stand on one, one for each leg, I see nba guys training in them all the time (i.e. Nash), I'd like to know what you call those things so at least I can look online and potentially buy one. I live in HK so I don't think saying "mini bosu balls" to a fitness store clerk is gonna work. Thanks.
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