…giant dog toy.
Light lunging over a ground pole can be a great way to engage the horse’s core muscles and develop some topline. The elevated step-over can also help strengthen weak stifles (which reminds me that it’s probably time to get out my poles for the winter since I won’t be riding up nearly as many hills…)
It can also, apparently, be a way to entertain one’s horse:
My favorite part of this video absolutely has to be how this horse goes from unenthusiastically plodding along to happy-trotting, waving his new giant dog toy around without a care in the world, totally ignoring his handler.
You do you, horse.