Best way to lose fat on arms?

Hey, so I kinda have that whole lift my arm up, and there's the lovely dangling fat hanging about. I don't have problems anywhere else, I'm healthy I do lots of sport - volleyball in fact. I have legs that are practically rock solid, and my stomach is in fairly good shape. My arms are strong, but the fat just seems to hang. I'm trying to work out how to lose it for our social in 2 months, because I'm planning on wearing a strappy dress without sleeves. help?
Best way to lose fat on arms?
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