How do you develop the rundown and introduce speed before asking for the sliding stop?

The rundown — the straight, accelerating gallop toward the end of the arena from which the sliding stop is asked — is not simply a matter of galloping in a straight line and then stopping. It is a carefully structured exercise in developing the horse's confidence, straightness, and commitment to speed in a specific context, and the quality of every sliding stop depends directly on the quality of the rundown that precedes it. A horse that is crooked in the rundown will be crooked in the stop. A horse that backs off his speed in anticipation of the stop will not commit to the slide. A horse that runs with tension and resistance will stop with tension and resistance. The rundown must be developed as a disciplined, relaxed, straight, and forward exercise before the stop is added. Begin by teaching the horse to rate speed on a straight line from a canter departure — accelerating from a slow canter to a hand gallop in a straight, controlled path without drifting toward the fence or falling to one shoulder. This straight-line galloping work establishes the pattern that the rundown requires: forward, straight, and committed to the direction the rider points him. Many horses will naturally drift toward the fence, which the trainer corrects by guiding back to the center of the arena rather than allowing the fence to do the work. A horse that learns to run straight to the center of the arena rather than to the fence will stop straighter and more consistently than one that uses the fence as a guide. Introduce speed incrementally over many sessions rather than running the horse at full speed immediately. Begin the rundown work at a hand gallop — a controlled speed well below the horse's maximum — and simply gallop the length of the arena and walk at the far end without asking for a stop. This familiarizes the horse with the rundown pattern, builds his confidence running forward in a straight line, and prevents the anticipation of the stop that develops when speed and stopping are always paired. A horse that has galloped the length of the arena twenty times without being stopped has no reason to back off his speed in anticipation — which is exactly the free, committed rundown that produces the best stops. Gradually increase the speed of the rundowns over weeks and months, always maintaining straightness and always occasionally allowing the horse to gallop through without stopping. When the horse is running freely and confidently at the speed from which you want to stop, is straight in his path, and shows no anticipation of the stop, the conditions for beginning stop development are genuinely ready.