Common problems in the run-around, and how to fix them.
If the horse:
If he starts speeding up on his own instead of responding to your cues for speed, break him down to a stop then back up. Then just sit for a minute. If that’s not helpful, make him collect up and slow to the last speed he was comfortable at, and continue doing the run around exercise.
Gradually, he will get more comfortable with speed and not make such a big deal about it (especially if you don’t!).
If he starts to lean during the build-speed part of the exercise (as toward the barn or gate), draw him back and change course about 30 degrees to overcorrect the lean, then continue on that line (see diagram). If he leans again, make another 30-degree correction, and so on.
If you wind up going in the opposite direction altogether, that’s okay—it’s the sort of “healthy confusion” that keeps your horse guessing and therefore paying attention to you. As you can, pick up the track of your Runaround again, and keep going.