OP --being able to see what the instructor saw was great for me! Kelly would use dots on the screen to show me what my position should be. I thought I was keeping heels down and chin up --well, maybe at the start but not always! She gave me exercises to do off the horse for strength and balance and keeping the heels down.
I also like that there was no time constraint. I could work on what she’d sent for me to do over and over, and when I thought I had it right, send off a video --or send one of me not doing it right and see where I was going wrong.
Amazingly, she almost immediately, first video, said she thought my saddle was too small for me and did not fit the horse well. That very day, my vet was out and said the saddle was making the withers sore —so off I went (illegally, too because taking Will to the saddle store and having the saddle fitter work on something for him was not allowed at that time) but we did social distance! After that, Will and I both improved. Oh, and Kelly had me pull my leathers up FIVE holes —that was a big difference too.
Frankly disappointed that none of the two trainers /instructors I’d worked with here saw that.