Posting trot is learning the UP beat of the trot. Sitting you must ride the down beat and scoop similar to cantering. That’s why so many get smacked in the butt when learning to sit because they are tuned into the up beat.

-Gigi, Chronicle of the Horse forum thread “WHY is the sitting trot so difficult to master?”

There are a lot of good suggestions in that thread, but this is the one that really resonated with me for some reason.

I’m curious to see if it works now!