You can have the best trainer in the world and a crap horse and it will not change your horses genetic structure. But I am asking these questions to the performance horse people around here, maybe they can teach others a bit.
So we will start at the ground work of their performance, what really makes them tick, less all of the psychological side (training.)
In regards to horses:
How can a muscle become striated?
Why does a muscle contract?
What combination, mixtures create (fuel) muscle contraction?
What are the inner workings of a muscle cell and what can I manipulate for performace?