The quality of a horse’s stop is directly related to the quality of his rundown. This exercise, in which you build to rundown speed, slow and collect instead of stopping, then go around the end of your arena and build to rundown speed again, is perfect for working on your rundown without the wear and tear of too many stops.
It also helps “take the brace out” of your horse’s stop as he learns to “downshift” his weight back on to his hocks to slow down, just as he must when he actually stops. If his first response to being slowed is to drop onto his front end, that’s what he’ll do when he stops, and that’s exactly what you don’t want. By not stopping, but instead just downshifting, you can reprogram that response.
The Runaround also helps you develop greater speed in your rundown. Many horses have a low “do not exceed speed” (if you do exceed it he’ll start to think he’s a wild horse!) By pushing your horse up to that speed, backing off and asking him to collect up and soften, then nudging him up to it again, you can desensitize him to going fast. He learns to “stay with you” and continue to respond as you “pour the coal on.” Every horse can develop a higher do-not-exceed speed, but some will remain more balanced and in control than others. This exercise helps your horse achieve his best, most controlled rundown speed.
Finally, if you practice the Runaround properly, your horse will naturally begin to slide in his stops. How far he slides will ultimately be determined by his genetics, your feel and timing, the quality of the ground, the nature of his hind sliding plates, and how he feels (i.e., whether or not he’s sore). But working on the Runaround will improve the quality of his rundowns, which will naturally improve the quality of his stop. In other words, work more on your run, and the stop and slide will take care of itself.