The aim of this drill is to help encourage you to rotate forward with your body rather than pulling at the grip end of the club or lifting the ball off the ground. By splitting your grip so that your hands are not touching it will make you turn your body so that your arms and body will work together and are more coordinated. Any arm swings, pulling of the grip or flicking the club head to lift the ball off the ground will result in your hands getting crossed up and the club head passing your body. You will start to find a way to turn your body as the sensation of an all arms or wrist swing is off putting. Where the club head hits the ground will be very inconsistent, until you start to turn more freely.