Why Lunge Line Lessons?

There are two images that come to my head when thinking of  beginner riding lessons.

Image #1 (The Scary, Rush to Trotting Image)

A beginner rider at their second lesson,  riding a horse at the trot along and arena rail. The rider is stiff backed, standing on their toes with legs out
in-front,  leaning backwards with  his/her bottom bouncing in against the saddle. The left hand has a death grip on the horn, the right hand is
bouncing/pulling on the poor horse's mouth as the rider attempts to use the rein for balance and the instructor yells, "say whoa!"
THIS IS NOT HOW TO LEARN TO RIDE!  (how many things are wrong with this?)

Image #2 (The Controlled Image)

A beginner rider at their second lesson,  mounted on a horse at the end of a lunge-line, they are riding at the walk and stretching their heels down,
working on getting into the  2 point position.  They are somewhat clumsy in finding their balance to stay at 2 point, but they are learning to softly come
back down into the saddle with a relaxed back and seat, thus feeling the horse's strides beneath them.
They are relaxed and allowing their body to feel for balance and rhythm.
This is how Beginner Lessons are Taught with JDK

Both Western and English Riders will learn the basics of a Centered, Balanced Seat.  
A proper seat will allow the rider to choose any riding discipline or event, from jumping to roping!