What does Anderson say about the importance of teaching a young horse to move away from pressure versus into it?

The distinction between a horse that moves away from pressure and one that moves into pressure — that leans against the halter, pushes into the leg, or braces against the rein — is foundational to everything in horse training, and Clinton Anderson identifies it as the single most important concept in starting a young horse correctly. In nature, a horse's instinctive response to pressure is to push into it — this is the opposition reflex. A horse that feels something pressing against its side or its face naturally pushes back against the pressure. This opposition reflex is what makes wild horses hard to catch and what makes untrained horses difficult to direct with any tool. Every piece of horsemanship training is in some sense teaching the horse to override this instinct — to move away from pressure rather than into it. Anderson teaches this override through consistent pressure-and-release work from the horse's first days of handling. The horse's head is turned slightly to the right with right lead rope pressure: the moment the horse tries to turn right — moves away from rather than into the pressure — the release is immediate and complete. Over many repetitions, the horse learns that pressure means move away from it, and that moving away produces relief. This learned response then applies to every rein, leg, and seat aid the horse will ever receive. The horses that are most difficult to train — that pull against the halter, brace against leg aids, and lean on the bit — are almost always horses in which the natural opposition reflex was never systematically overridden. These horses either were not taught to yield to pressure as young horses, or were trained in ways that inadvertently reinforced pressure into pressure — a rider who increases leg pressure when the horse leans into the leg is teaching the horse that leaning into the leg eventually removes the pressure. Anderson's emphasis on teaching this principle correctly from the beginning — with immediate, consistent releases the moment the horse moves away from pressure — is the cornerstone of everything else in his program. A horse that genuinely understands and applies this principle is a horse that can learn any subsequent skill more easily because the communication channel is functioning correctly from the most basic level.