The ultimate purpose of an optimally fitted saddle is to achieve a balanced seat for the rider and maximize their weight bearing surface. This puts the rider and horse in balance and harmony with each other.
Any disruption of this balance can cause a loss of connection and will hinder the natural movement of the horse. Many times this will lead to a horse experiencing joint problems, muscle soreness, and anxiety.
An out of balance horse will not develop muscle symmetry and will affect the rider as well. Their body can lean backward or forward, sit with a chair seat or develop asymmetry to the left or right, which requires the horse to unevenly compensate.
When the rider and horse are brought into balance together through proper saddle fit, training goals become easily attainable and the partnership can grow.