Asking a horse to move sideways and to move his shoulders and hips independently is a foundational piece to training more advanced movements later. It is also a practical skill on its own for opening gates, placing a jacket on a fence, or moving your horse on the trail to allow another horse to pass, as a few examples.
The “technical term” for moving a horse's shoulders and hips is turn on the forehand and turn on the haunches. Both these movments are easy to teach when they are done slowly and correctly.
In today's video, I work with Laddie, a young Gypsy Vanner, to demonstrate teaching these two movements.