Don't let lack of trimming cause incorrect action or conformation. Train the horse to lead correctly. Train the horse to lead so that his head is just slightly back and off to the right of your right shoulder. He should respond to you quickly at a walk or trot. Horses with good action show better when moved at a brisk gait.
Horses moving slowly sometimes show a springy action and, in some cases, drag their feet.
The horse that moves out well will flex at the joints and have a smoother flowing action. A light tug on the lead shank should bring the horse to a stop. The horse should settle down, but be alert after the stop. Train the horse to stand. A horse can be trained to stand when you face him, and to follow you when you turn your back to him.