I do not slow down my horse – I shorten his stride.
Moving his center of gravity back by raising his shoulder up and bringing his hips closer to his shoulders. (light contact with the bit). will shorter the frame of the horse. (short frame short stride fig -A-1).
Riding small circles Left and Right, will shorten the inside of the horse. (short frame short stride fig-B-2).
Shoulder In (figB-3), Hunches In
Shorter Distance Ground Poles will shorten the frame of the horse. (short steps short stride (fig-C-1).