The Deep Seat.
For Centuries, the deep seat was the fundamental seat of horsemanship. The deep seat connected the riders balance to the horses balance and required the rider to alter his balance 180 degrees from his natural balance to be in sync with the horses balance.
The deep seat was were all the skills and understanding of horsemanship evolved from. When you understanding the connection between feelings the horses balance and moving with the horses balance, the deep seat becomes the core of riding. Since the deep seat is about the feel of balance, there in no perfection of the deep seat, there is only the practice of developing a quality deep seat.
While a correctly built deep seat is the key to quality riding and quality horsemanship, and incorrect deep seat does just the opposite.
If your horse steps in a hole with his right from foot, you natural reaction will be to correct your balance by catching yourself with your right foot. This places all you weight on the foot in the hole.
If you have a correctly build deep seat, when your horse steps in a hole with is right front foot, you will shift you weight to your left seat bone and back. This set of rider reactions can only be built by riding outdoors over rough terrain and riding only with balance, not stirrups or grip. It is a set of reflexes that has to be practiced daily in order to keep the skill in practice.
As a rule, the deep seat is no longer being taught or built today. While the first stages of building the deep seat are being practiced:
Riding in rhythm and an independents seat.
The third stage of riding in a correct balance can only be achieved by practicing the skills of the first two states and riding with balance only in outdoor riding.
We have eliminated the third and most important stage of the development syncing of the riders balance with the horse’s natural balance a deep seat and replaced that stage of development with grip or the light seat.
With the deep seat no longer in practice today, it is impossible to really provide a quality method to develop a quality deep seat.
Most saddles today are built around a light seat where the stirrups are forward for jumping and other competitive events. The issue is these specialty saddles were originally extensions of a quality deep seat and the skills of a deep seat were developed on saddles with quality wooden trees and no stirrups or stirrups directly under the seat of the rider. From my experience you cannot learn a correct deep sear from those saddles, you have to transfer the skills of a deep seat to those specialty saddles.
I try to ride about 10 outdoor miles a week in a deep seat with minimal stirrups and grip to keep my deep seat at least functional.
The biggest issue with the deep seat, is when you understand the dynamics and the impact a quality deep seat has on quality horsemanship in general, you cannot not break the issues down, without causing issues for the past 100 years of horsemanship that have been largely build on a recreational seat.