What is the correct pressure level to use in training?

The correct pressure level in any training interaction is the minimum amount necessary to motivate the horse to search for a different behavior — enough to create the discomfort that drives the horse's search for relief, but not so much that the horse is pushed past its threshold into a flight response where learning is no longer possible. This definition is horse-specific and moment-specific rather than absolute: the correct pressure level for one horse on one day in one training context may be entirely inappropriate for the same horse on a different day or a different horse in the same context. The skilled natural horseman learns to calibrate pressure continuously based on real-time reading of the horse's response — starting light, observing whether the horse is genuinely searching for a response or is unaware of the pressure, and escalating only as needed to produce genuine engagement with the training task. Tom Dorrance's foundational principle was to start with the lightest possible pressure and escalate only if needed, releasing at the first try regardless of how small — this approach develops the horse's sensitivity to light aids over time rather than training the horse to wait for strong aids. The common mistake of applying pressure that is too strong immediately teaches the horse to ignore light pressure because it has learned that the trainer will always escalate to the level that actually motivates response. Conversely, pressure that is too light — below the threshold where the horse is aware of it as a request for a response — simply fails to communicate anything and teaches the horse nothing. Finding the appropriate pressure level requires genuine feel — the ability to read whether the horse is engaging with the communication or ignoring it, and whether the pressure is approaching the horse's threshold rather than staying well below it.