Martingales for Cutting Using a martingale in the practice pen can set you and your horse up for success in the show pen. By H&R Editors | October 28, 2021 Click here to watch now! Using a martingale on your horse in the practice pen will help him keep his head lower through the turns or keep his head lower while working on backing. Learn how to properly use one with RL Chartier. Click here to watch now!