Agree!
After watching OP videos I can see her reins are long and horse is not connected and she is running away from her seat. If they aren’t connected, you can’t feel them dropping you until it’s too late and way harder to put back together again.
My suggestion is to
- Shorten reins
- Develop a nice connected medium walk with your legs draped long.
- Pick up a trot (concentrate on the first few steps and feel how the hind legs feel under your seat. It should be pretty easy for the first few steps to sit that trot)
- Notice when your body wants to grip? That’s when you need to half halt and rebalance. Actually before your body wants to grip is when you should be half halting.
- If you can’t half halt, do a full transition to the walk and regroup as quickly as you can and ask for trot again and repeat the steps above.
Ideally you’ll get better and quicker and feeling when you’ve lost the balance and you’ll get quicker at fixing it so that you’ll only need very small half halts to bring her back into balance if your reins are the appropriate length.
When I notice my body gripping I first “think” rock him back into his hind leg, jello butt, legs long and then send him forward again into that renewed connection. It also helps me to imagine that I have a huge belt buckle on and I want that buckle to be bouncing up and down. That’s where the movement goes. You’re lower back must be very mobile to let that buckle bounce.