I refined one of my rider’s understanding of her seat earlier this week.
In walk she sits squarely, nicely upright, but in trot she collapses her lower back. After a quick chat, it became apparent that the collapsing is when she’s trying to use her seat to send her horse forwards. But this was counterproductive as her shift in position hinders him.
I used two analogies to begin with. The first, is to think of a bucket of water sat in your pelvis. Sitting squarely and correctly, the bucket can be brimful and not spill a drop. My rider keeps her bucket of water full in walk, but in trot, the water spills out the back.
The other thing that I wanted her to think about were the four corners of her seat bones. We only have two seat bones, but I think it’s better to think of them as having four points. Sitting correctly in halt a rider should feel that they are sat evenly left to right, and front to back. I.e. they can feel all four corners of their seat bones. When they can feel all four seat bones that bucket of water is brimful.
I sent them off in trot, tweaking their position slightly so that my rider kept feeling all four seat bones and didn’t spill her bucket. This is when the seat is in a neutral position. It’s not hugely effective, but it’s the best place to start. In order to keep her horse trotting forwards she used more voice, more leg, and a couple of little taps with the schooling whip. We had to break the cycle of her feeling the need to collapse her core when in the sitting phase of rising trot. With a more active trot she could keep her seat in neutral until she recognised when she deviated, and started to build some muscle memory.
Once my rider felt she was keeping the bucket of water inside her hips steady and could feel all four corners of her seat bones, we revised how a rider should weight the inside seat bones slightly on turns before putting that into practice.
Next up, we returned to the original discussion about using the seat. The horse was more forwards now, so more responsive to changes to her seat, which makes the learning process more rewarding as she gets instant feedback.
To send a horse on, or drive them forwards with your seat, you want to rock onto the back two corners of your seat bones. This opens up the front of your body and allows your seat to swing with the horse and encourage the energy to flow from the hindquarters to the front. If you rock your pelvis from neutral onto the back two seat bones in halt, you soon realise how slight a movement it is. When my rider tried this, she realised how she’d been trying too hard when she’d collapsed her lower back.
You can also think about that bucket of water. It’s no longer brimful, let’s say an inch from the top. When you rock onto the back of your seat bones to encourage more impulsion, the bucket will tip slightly. But you don’t want that water to slosh out the back. It’s a refined movement.
They practised changing between a neutral seat and a driving seat, until my rider could feel the slight differences in her position and could control it, and then the horse was responding to her seat aids.
Finally, we discussed the seat as a downward aid; rocking onto the front two seat bones, without spilling the bucket of water out the front, to help collect her horse, and to help ride a downward transition.
Then we put it all into practice, buy thinking of the bucket of water and the four corners of the seat bones, they rode transitions within the trot, circles and serpentines (making sure they didn’t slosh the water out the side of the bucket) until my rider felt in control of her seat aids, understood what slight movements they are, and was getting the correct response from her horse, who also started moving in a more forwards manner because he had clearer seat aids and she was carrying herself in a balanced way.