We have this method thats usually done after there's been a grading. We usually fold the belt up into 4 so that it's about a foot in length and then have a partner hold the belt at either in vertically. We then pratice mae geri, using the belt to "drive" through to the oponents stomach. We also then pratic maewashi geri, with your toes pointed up (like mae geri) to the side of the belt! The 2nd is done as slowly as possible