However, it is not an old theory in dressage, either: François Baucher trained a similar method, although he did all his severe flexing at the halt, and in addition he connected the posture of the hind legs to the mix.
Although not an established practice in dressage, François Baucher utilized a technique similar to this one, but he executed his intense flexing only at the halt and connected the position of the hind legs to the overall movement.