After walking up and down the driveway for about 15 minutes to start our warm-up, we walked into the indoor arena to find this set-up:
I should note that I really had to up my game in Photoshop to do the diagram because of all the different sets of poles. They were colored in the arena too, which really helped me figure out what I was supposed to be doing. I'm sure you can see that there are almost endless possible exercises. I'll highlight the ones that we focused on.
We started off using the red poles near A. We did a variation of spiral-in, spiral out, which is a great strengthening exercise even without the poles. We were tracking right around the arena and began the exercise by trotting a circle through the middle of the poles. Then, we tightened the circle by about a meter and went over the inside of the poles. Finally, we expanded the circle by about 2 meters and went over the outside of the poles. And we repeated variations of those circles in both directions. The great thing about this exercise is that not only does the size of the circle change, but so does the length of stride. So you and your horse really have to focus on accuracy. One problem that we had was that I wasn't using my outside rein as firmly as I should have been, which resulted in Nimo's shoulder bulging to the outside. This is a chronic issue for me, and this exercise really highlighted it for me.