Trotting Arcs in Trail Once you can go over trail poles in a straight line, up the degree of difficulty with arcs. By H&R Editors | November 22, 2021 | 1 minute read Up the degree of difficulty when practicing trail poles by asking your horse to move in an arc by going over one pole and then the neighboring pole. Will and Elizabeth Knabenshue walk you through the process and explain the benefit of the exercise. What did you think of this article? Submit Rating Thank you for your feedback!