Nancy Later teaches this informative lesson on the proper use of the German Martingale.  She explains how it can help a developing rider and how to begin using it.  They look for this young horse to carry his own forward, positive trot in both directions.  Nancy asks the rider to make sure that she can move her off her leg, and allows her to travel in a longer frame as they start.  They warm up in the canter expecting him to be responsive to the aids while not expecting him to be perfect.  She has the rider change his posting diagonals on the circle to help him relax and give his back.