How does Buck Brannaman approach groundwork differently than Clinton Anderson?

Buck Brannaman and Clinton Anderson both use groundwork extensively and both root it in pressure-and-release principles, but their approaches differ in ways that reflect their broader philosophical orientations and the different qualities they are primarily trying to develop in the horse through the groundwork. Brannaman's groundwork is primarily concerned with developing the quality of the horse's thought and the softness of its responses — he is watching for genuine acceptance and softness in the horse's yielding rather than simply the behavioral fact of the yield, and he will continue working on a specific exercise until the horse is yielding with genuine softness and engagement rather than with grudging compliance. His groundwork is organic and responsive to the specific horse's needs rather than following a prescribed curriculum, and the exercises he chooses at any given moment reflect his reading of what the horse needs to develop most urgently rather than a fixed sequence. Anderson's groundwork is more explicitly structured around developing the horse's respect for the handler's direction — his exercises are specifically designed to establish the handler's authority to direct the horse's feet — and the quality he is primarily measuring is reliability and promptness of response rather than the softness and genuine acceptance that Brannaman emphasizes. Anderson's groundwork exercises tend to be more repetitive and higher-volume than Brannaman's, reflecting his conviction that consistent, extensive exercise develops the respect and reliability he is working toward. The practical result of these different emphases is different horses: Brannaman's approach tends to produce horses that are genuinely soft and self-directed in their responses, while Anderson's approach tends to produce horses that are reliably obedient to specific exercise protocols, with the quality of genuine softness and self-direction more variable.