I think part of the issue is using the Word SAVE. In Poser, you ADD Animations to your Pose Folder using the Plus Signs at the bottom of the Content Display. When you Add it, make sure you have the Body selected. It will not Add the Wall, but will Add the 3 Frames of motion. Also, I am assuming here , but since you say you are new I am going to guess that you did each Frame of the Animation. You only need to set the Pose in Key Frames to make the Frames between Key Frames fill in with the Animation. Also, when having something stop and change direction you most likely want to Break the Spline of the Animation at the point it hits the Wall (or the Apex of the movement in the Animation Graph). This will make the direction change quicker (as in a bouncing ball.)

ratscloset
aka John