The Dallas Cowboys were ranked 31st in the NFL in rushing yards during the 2012 season.
DeMarco Murray rushed for 663 yards while missing six games.
"We just left a lot of yards out there," running backs coach Gary Brown said. "I think a lot of guys just wanted to hit home runs more than get those yards that may be ugly, so to speak. We left a lot of yards out there, and I think they understand that. I think we're going to try and do a great job of getting those yards they left out there."