New year, new rules: Rule No. 18

Rule No. 18: Permit the "12-to-6" elbow

UFC's popularity is rooted in its no-holds-barred mentality, so why is the straight-from-above elbow illegal? "It's no more powerful than an elbow from the side," says mixed martial artist Jon Jones. And what's worse, a blow you can see or one you can't?

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