Piedmont - I can try!
Keep in mind this is only based on a few lightbulb moments during last night's ride, and I won't know for sure if I'm onto something until I am able to reproduce it in several consecutive rides with the same positive results.
Prior to Baby No. 2's arrival, I felt I could sit Bliss's trot reasonably well. Looking back on old video, it's obvious that while yes I was sitting, I wasn't doing it correctly. (And I will add some video that demonstrates this later). Here's the video:
https://www.youtube.com/watch?v=hoXb-ikKf7M&t=34s Check out the sitting trot at the beginning. Not pretty!
Fast forward to this spring, I've been trying and trying to sit the trot like I used to but it just doesn't work anymore. I don't know if it's because I've changed, but I suspect it's because Bliss is moving more freely and there is more motion than I can possibly accommodate incorrectly. Anytime I tried to sit, Bliss would lose impulsion and jam up. As you'll be able to see on the video I'll post later, my seat bones used to rock a bit, so I was essentially doing the hula tummy. I was also allowing my lower legs to fly around to absorb the motion.
I never even realized I was doing this until the clinic two weeks ago. I was trying to sit for a moment and the clinician said "quieter with the lower leg. " And so I've been trying to be quieter with the leg since then. I've been experimenting with holding with my lower legs, which forces the motion absorption upward. Last night, every time I tried to sit and hold with my lower legs, Bliss would jam up even more. I realized that I was trying to hold everything too tightly and that made my seat bones positively grind into his back. When I released the holding in my lower legs to just a "breathing contact" and allowed myself to feel softer in the hips, my back could stay straight, my chest opened, my seat started feeling like it was floating up over his back and the up and down movement in his back was really exaggerated. I could feel his barrel swinging from side to side. I could feel his back coming up underneath me with each stride. There was MORE movement everywhere but it felt really fluid everywhere, and Bliss started coming through better, and the transitions t/c/t started to improve drastically within about a minute. We got hands down the best t/c transition we've ever had, and it was on his harder side, so we stopped there.
So I've really only had a few brief moments of this new fluid and light feeling, but based on the quality of the transitions I think I'm on the right track. But I really need more time with it and some video to be certain.
It also makes me wonder if I've been squashing/grinding his back in walk and canter as well. So I plan to play with it and see what happens.
Hope this is helpful. I have a very difficult time explaining feelings.