Pull the bar apart, and break it in half. This is a coaching cue to get the bar in the proper position and get your back tight. When you do this movement, and hold it while you squat, the muscles all the way down your back will active and stabilize your spine that much more. It puts your shoulders down and back where they should be. It keeps your chest up which in turn keeps your from falling forward. You can't go wrong with pulling the bar apart!