Chicago Bears running back Matt Forte called the NFL's proposed rule change that would penalize ball carriers who lower their heads to deliver a blow "absurb" in a series of messages he posted on his official Twitter account Sunday morning. The new rule would penalize a runner 15-yards if he initiates contract with the crown of his helmet outside of the tackle box. Incidental contact with the crown of the helmet would not be a penalty. "The proposed rule change for running backs might be the most absurd suggestion of a rule change I've ever heard of," Forte wrote. "In order to lower ur shoulder u obviously have to lower ur head. It's a way of protecting ur self from a tackler and a way to break tackles." Forte believes players would be unable to adjust if the new rule is put into place. "U can't change the instinctive nature of running the football," Forte added. NFL competition committee chairman Rich McKay cited player safety as the motivation behind the possible rule change during an interview last week with the Associated Press.