The renvers (haunches-out) is the inverse position of the haunches-in, with the horse's tail turned toward the wall, instead of toward the inside of the arena. When this movement is performed along the rail, the horse's shoulders must be brought off the track as the movement begins, so that the haunches will not bump into the railing.
To perform the haunches-out at the walk or trot while moving counterclockwise on the long side of the arena, bring the horse's shoulders off the track into a left shoulder-in position. Then create a right bend with a right indirect rein while simultaneously sliding your left leg back to keep the haunches on the track. Sustain the bend and impulsion by firmly pressing with your right leg at an at-the-girth position, for it is difficult to bend the horse outward when it has just been bent inward on the preceding corner of the arena.
The aids, then, for the haunches-out while moving counterclockwise around the ring are:
The travers and renvers are particularly beneficial for schooling a tense horse. Animals that have a keen temperament are often distracted by the smallest movement in or around the arena. The upper-level lateral movements, which promote the horse's concentration, can work wonders in making a high-strung animal pay attention to its work. They also are physically demanding and rid the horse of excess energy sooner than less difficult movements.