Through the groundwork, the horse learns to understand the different positions of the whip. The whip is considered a prolonged arm, like a conductor’s baton. A physical touch is mostly not even necessary. If horses grow up within a herd, they usually have an easy and nearly natural access to understanding our aids through the position of our body, the whip and our voice which can still be used either from the ground or in riding. Therefore the horse can understand a structure and relevance and adapt to the new situation and aids.
The more the horse listens trustfully to my body, the less I have to use secondary aids, and the more it feels like melting to one body, just like a Centaur ( lat. Centaur”horseman”, a mythological creature with the lower body of a horse and the upper body of a human). It goes without saying that melting is impossible without mutual trust.