Yes I do work a lot with trainers as well and sometime also with family members of the athlete.
How many times did you hear a trainer say "you don't understand me!" or "you don't listen to me!"
The fact is that sometimes the rider doesn't understand because the trainer uses words, expressions, timings, etc that are not aligned with the rider.
Knowing a lot of techniques and being a good teacher doesn't always mean that you are helping your pupil 100%.
Knowledge on communication, on how the mental warm up of the rider works and of which words can be useful and which words can instead be harmful for the rider's concentration and emotional state is fundamental if you want them to perform at their full potential.
In fact sometimes both trainers and parents might unconsciously influence negatively the riders because they say some things that might put the rider in an emotional state that is not useful for him or her to be before the competition.
Of course both the trainer and the parents want to help and support the rider so what they say to him is absolutely for his or her well being but the result isn't often what they aimed for.
So yes James I work with many trainers and work a lot on their way of expressing themselves so that they can be understood better by their pupils, I work with them on how to give better feedback to their pupils so that it can be better accepted and understood and also on techniques that allows them to understand better the ways of thinking of their pupils to improve the understanding of both.
I also work with them on how to manage their emotional state better so that they can support better their pupils.