They can do long lever adjustments, which the horse doesn’t seem to mind, but they are rather alarming to watch. Effective, though, but you wouldn’t want it to go wrong.
I now use a chiro vet, who uses short lever adjustments.
Yes, I was sceptical but she pointed out some rather obvious imbalance. She straightened him out which was a bit shocking to watch but he is moving better.
He had his routine sports massage about 5 week later (spoiled happy hacker) and I'd forgotten to mention it until the therapist said she felt a rather obvious and significant improvement.