What makes a good backup in reining?

A good backup in reining is straight, soft, prompt, and cadenced — and all four of those qualities must be visible to the judge for the maneuver to score well. Straight means the horse tracks directly backward in a line rather than swinging its hips left or right, dropping a shoulder, or drifting off the intended path. Softness means the horse gives through the poll and jaw as it steps back, moving willingly from a light rein aid rather than bracing against the bit, gaping its mouth, or raising its head in resistance. Promptness means the horse begins the backup immediately when the rider asks rather than hesitating, rooting forward, or requiring multiple cues to initiate the movement. Cadence means the steps are rhythmic and even rather than quick and shuffling in front while dragging behind, or vice versa — each diagonal pair of feet should move in an even, two-beat rhythm with the horse tracking cleanly backward in a straight line. In the show pen, the backup is often the last maneuver of the pattern, and it is the final impression the judge has of the horse before scoring. A horse that backs with obvious resistance, crookedness, or lack of willingness at the end of an otherwise good run can cost points that the run had already earned. A horse that backs lightly, softly, and straight after completing the pattern demonstrates the softness and training that should have been present throughout the run. The backup reveals the quality of the horse's foundation in the bridle as clearly as any other maneuver, because there is nowhere to hide bracing, heaviness, or resistance when the horse is asked to step backward from a still position with no forward momentum to compensate.