Sly and De Niro Spar in the Ring

"I love people in their 60s and 80s 70s who are still trying to be better than they were," he said. "Sylvian was like a different person when I first met him." The actor has been working out with De Niro's stunt double Greg Rementer for the past few months. He says that while sparring, Sly just calls it and goes back into the back of the gym. Sixty-five minutes later Stallone comes out wearing a top hat and walking towards his training partners.