The task above is a good one to prepare a horse for being restricted behind, as in a horse trailer. It is also a task for preparing a horse to back between cart shafts.
Rather than correct something that did not go well, we learn to reset* a task without placing a negative value judgement on what the horse just did. This makes a huge difference to how horses perceive their training.
Clicker-savvy* horses often don’t want their sessions to end. The positive vibrations that go with good clicker training make it fun rather than a chore.
Clicker training gives us a way to let the horse know instantly, by the sound of the marker signal* (click), when he is right. It takes away much of the guessing horses must do as they strive to read our intent* (which is often fuzzy to them).
A horse’s perceptions and world view are quite different from human perception and world view. While we are with our horse, the more closely we can align our world view with that of the horse, the easier it is for him to understand us and comply with our requests.
There is much more about this in my book: Conversations with Horses: An In-depth look at the Signals & Cues between Horses and their Handlers available as an e-book or a paperback.