[okie]

Find a low bench. Take your stance with a club and allow the shaft to rest on the edge of the bench. Move move the shaft back and forth using the bench edge as a straight line guide. what you will notice is that although the shaft appears to be moving straight back and through the clubhead is moving in an arc (circular.) This should cure once and for all the idea of swinging "along" the target line in the traditional golf instruction sense. I worked very hard as a squirt to develop the much prized in to out swing. Accordingly I developed a below plane backswing and an above plane follow through. It will give you a sense of the plane. Hitting hundreds of basic motion shots using pvc bench is one of the best things I have done for my game.