When done properly, an L-shaped back-through in a trail pattern should look almost effortless. Acing this type of maneuver requires hours of practice, teaching your horse to back with ease and cadence while listening to a combination of your hand, leg, and seat cues.
Nancy Cahill uses a tree and a box made of poles to help her horses master a supple, collected backup.
Here are step-by-step instructions for putting together your own L back-up obstacle when practicing for trail classes.