I was once asked a question at a clinic that I had never heard from other trainers, nor had any of the lunchtime crowd come across the question. It made me, and most people, feel uncomfortable. It may make you uncomfortable too.
The German Training Scale (GTS) is often used as the guide for modern competition dressage training. People use it as their bible on their travels to become dressage megastars.
How do you help your dressage horse feel happy to do another bloody circle? How do you help your Arab feel glad to be training for another damn endurance ride? How do you turn being caught for the farrier into something your horse does not dread?