So how useful is sitting the trot at medium and extended in lower-level dressage?
One of the posters above says that sitting lets you make the gait more uphill, lighter in front. At the moment, I’m working on collected/medium trot transitions. My horse has small gaits, so she’s very easy to sit or post, either way (definitely not a 7 gait!). I can feel the moment she starts to carry herself; it’s not as dramatic as it would be in a big moving horse, but it’s there. However, we can maintain it either sitting or posting. I sit for the collected trot, but when we start to lengthen a bit, whether I sit or post doesn’t appear to have much effect on how she moves or how long she maintains the correct movement.
So what is the technical rationale for sitting all the trot work in dressage, other than to make it a challenge for the rider ? I’ve been wondering this for a bit, and this seemed like the right thread to ask the question.