Ronda Rousey does a lot of things really well inside the UFC Octagon. But her signature move is her armbar. It's so potent that The New Yorker put together an entire video about the move last year:

Last night, Jimmy Fallon asked Rousey to demonstrate her infamous armbar on him. And while he only lasted like 0.1987452 seconds in it before tapping out, he still got his point across. Rousey's armbar is not to be f*cked with!

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[via For The Win]