I get motion sick on boats in the ocean, or when reading a book in a car, but haven’t in the right seat yet. Looking into it long ago, I read that motion sickness could be caused by the body/inner ear feeling you moving around but the eyes not sensing it (due to looking in the car or close by at static objects).
So, like when driving, I work on keeping my eyes up looking far up the track, constantly scanning, and watching the student in my peripheral vision, or only glancing at him/her. Maybe it’s placebo effect, but it’s worked for me so far, even with a really jerky student or riding with Robby