Nuno Oliveira wrote in Reflections on equestrian art, the following small chapter “Horses held with/without contact.” He says.
I regret very much that so many riders are not acquainted with the book Extérieur et Haute Ecole, written by Captain Beudant.
Therein it may be read that it is only by allowing horses to move on a free rein, and not in holding them in, that success may be obtained. Riders who hold in their horses are insignificant riders and will never advance.
Riders who give their horses freedom are those who will taste the delicacies of equestrian art.