Preview: Rener Gracie Feature in HBO's 'Real Sports'

Sign up for ESPN+ right here, and you can then stream the UFC, PFL and “The Ultimate Fighter” live on your smart TV, computer, phone, tablet or streaming device via the ESPN app.

Mixed martial arts' first family takes center stage in a segment airing tonight (11:00 p.m. ET/PT) on HBO's "Real Sports." Rener Gracie is profiled by HBO Correspondent David Scott as the police department in Marietta, Georgia, has incorporated the soft art into its training repertoire.