Explain why training a horse to drive pays dividends later in the training cycle?

The dividends of correct ground driving work appear at every subsequent stage of the horse's training — the horse that was carefully ground driven simply seems easier to develop, more relaxed under saddle, more responsive to rein communication, and more confident in new situations than horses whose preparation skipped that step. The most immediate dividend is rein literacy. A horse that has been correctly ground driven understands what rein pressure means and how to yield to it correctly before a rider ever sits on his back. That understanding does not need to be taught under saddle — it arrives there already established, which means the rider's early rides can focus on the horse's acceptance of weight, balance, and forward movement rather than simultaneously teaching rein responses to a horse encountering bit pressure for the first time. The acceptance of pressure from behind that ground driving develops pays specific dividends when leg aids are introduced under saddle. A horse that has spent many sessions accepting the long lines touching his sides and hindquarters and the trainer moving behind him has developed the equanimity toward that category of input that makes the introduction of leg aids genuinely straightforward rather than alarming. The stop from bilateral rein pressure — established through repeated ground driving practice — pays safety dividends throughout the horse's entire ridden career. A horse whose first instinct when both reins are closed is to yield through his jaw, slow his poll, and halt has a trained response installed before the first ride that functions reliably in subsequent ridden work because it is genuinely confirmed rather than hoped for. The confidence developed through ground driving pays longer-term dividends in the horse's overall trainability and emotional stability. A horse that has been systematically exposed to new experiences and new demands through ground driving arrives at ridden work with a generalized confidence in the training process — an understanding that new things are manageable and that the trainer's requests have correct responses that can be found through a soft try. That confidence is the foundation of the willing curious forward-thinking horse that every trainer wants to develop.