Elves are definitely not "weightless" (at least not in the sense that first comes to my mind), otherwise they would be able to jump as high as they wanted or even fly. Elves are however, the most graceful and agile sentient beings upon middle earth. They aren't "weightless," they just more or less have super-hero, mojo-esque moves.
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Those who the Gods would destroy, They first make mad.
~Those Crazy Greeks
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