I have a horse in WP training at a big name trainer here in Oklahoma. Once the trainer got him to work off leg cues (direction & gaits) he worked on headset. The gaits were rather quick in the beginning, but after extensive riding with the head being reined in at all gaits, they began slowing down. The trainer told me that when the horse doesn't know how long you may keep him in a gait, he'll conserve his energy & go slow. And once they go slow with little correction, he begins to get their outline right & get them driving with their hindquarters.
Every great dream begins with a dreamer. Always remember, you have within you the strength, the patience, and the passion to reach for the stars to change the world. ~Harriet Tubman