UFC women’s bantamweight champion Ronda Rousey and former UFC lightweight and welterweight champion B.J. Penn roll in this undated clip. The sparring takes place at the famed Guilherme and Rafael Mendes brothers’ academy in Costa Mesa, California, Art of Jiu-Jitsu.

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http://www.mmafighting.com/2015/2/17/8051465/ronda-rousey-and-bj-penn-spar-at-art-of-jiu-jitsu