(3) Work in the double bridle, which may be subdivided into two parts:
(a) All work with the snaffle is repeated with the double bridle. Instruction is completed as regards the upper aids. The horse is confirmed in his work at the gallop and finally is taught the change of lead. Here is where ordinary training stops; training sufficient for the horse of the trooper.
(b) Preparatory period for high-school work in which the obedience of the horse is further developed by a system of exercises that increase his suppleness and strength. He acquires cadence in gaits and becomes light, or, more precisely speaking, balanced.
High-school work might be considered as a fourth period , and the animal would then be taught the different manners and steps of which this school is composed, such as the high trot, in place and gaining ground, and the change of lead with each stride.
- See Question XXVI.