How do you use groundwork to fix problems that have developed under saddle?

Using groundwork to address problems that have developed under saddle is one of the most practically valuable applications of the natural horsemanship principle that mounted problems are almost always expressions of training gaps that exist independently of whether a rider is on the horse — gaps that are often more clearly visible and more efficiently addressed on the ground than from the saddle. The general approach is to identify the specific response or quality that is lacking under saddle — a horse that is dull to leg pressure, for example, or one that braces against rein contact, or one that rushes in a specific situation — and trace that problem to the specific concept or response on the ground that it reflects. A horse that is dull to leg pressure typically lacks a genuinely confirmed response to driving pressure from behind the drive line in groundwork — the concept of moving forward promptly from light pressure has not been installed with sufficient clarity and depth to hold under the additional challenge of carrying a rider. Addressing the groundwork version of the problem — developing a prompt, energetic response to very light driving pressure from behind the drive line, with escalating pressure applied only when the light aid is genuinely ignored — typically produces significant improvement in the mounted version of the problem because the fundamental concept being reinstated is the same in both contexts. Buck Brannaman's consistent recommendation to return to groundwork when mounted problems appear reflects this principle: the groundwork makes the specific training gap visible and addressable in a lower-demand environment where the trainer's feel and timing can be more precise and where the horse is less likely to escalate to a dangerous response while the training gap is being addressed. The mounted work then builds on the improved groundwork foundation rather than trying to install the missing concept from the saddle where communication is more complex and consequences are higher.