While there are some commercials in this video clip, it shows why we "Lunge" a horse. Clinton Anderson is one of the most highly-regarded horse trainers in the World! While he was raised in Australia, he now lives in the United States and makes videos on horse training.
He can answer for us, why we "Lunge" a horse in his video, "Clinton Anderson Presents: Gaining Control and Respect on the Ground". He shows us how to "Think like a horse."