Zack Sharf Digital News Director Sylvester Stallone revealed on the TMZ special “Arnold & Sly: Rivals, Friends, Icons” (via The Daily Mail) that a near career-ending injury in the lead up to “Rocky II” threatened to end the boxing franchise before its first sequel got off the ground. Stallone was training with bodybuilder Franco Columbu about a month and a half before the “Rocky 2” shoot when he ripped his pec muscle right off the bone. “So, I go down, and it’s maybe only 200 [lbs].