Rener Gracie

Rener Gracie -- whose family is credited with creating Brazilian jiu-jitsu -- is teaching cops a new restraint that he says is safer than a chokehold, and he demonstrated on one of our own to hit the point home. The MMA legend joined us on "TMZ Live" Tuesday and broke down the move, which he calls…

Rener Gracie is MMA royalty -- a member of the legendary Gracie family which created Brazilian jiu-jitsu. But, he's also a fashion designer -- and he tells TMZ Sports his business went CRAZY a few weeks ago when he made a deal on "Shark Tank." Rener is the creator of Quikflip -- which started as a…