Square Corners Drill Use the square corners drill to improve your ranch riding square corners. By H&R Editors | August 18, 2019 | 1 minute read Bud Lyon explains how riding in square corners teaches your horse to willingly guide and listen to rein cues. This drill will help horses in any discipline freshen up the steering. Ready to join? Check out our 7-day free trial here. What did you think of this article? Submit Rating Thank you for your feedback!