“Half turn” and “reverse” could, in this case, be expressed “left half turn,” but “in reverse” has particular significance, and the terms should be retained on that account.
Haunches In.—This movement is one to exact obedience to one leg while marching. It continues the suppling of the hind quarters and confirms the obedience to the leg. It should be undertaken only when the horse yields readily to the legs in previous exercises.
Marching on the right hand, use the left rein of opposition and the left leg. It is sufficient if the horse swings his haunches to the right so that the left hind foot steps on a line passing through the prints of the right fore foot. The left rein of opposition assists the action of the left leg. At first one step is sufficient to demand at a time. Repeat the movement several times, gradually demanding more steps in the correct position. Never demand the movement, at any one time, over a greater distance than the long side of the riding-hall. The following cautions should be carefully observed:
1. Never let the horse’s body make an angle of more than 45 degrees with the original direction. To prevent this, use the inside leg.
2. Never let the gait diminish. To prevent this, use both legs when necessary to demand impulsion.
3. Do not lean to the left when moving to the right. The weight of the body should be slightly more upon the right buttock when moving to the right.
4. Do not let the right rein be slack when moving to the right.
Shoulder In.—This is a similar exercise to haunches in, but more difficult and more useful.