
The rein-back is a dressage term to indicate the two-beat movement in which a horse is asked to back up. The horse picks up and sets down its feet almost in diagonal pairs, and moves straight backwards with the line of his forelegs following those of his hind. The horse should remain on the aids during the rein-back. The rein-back should be practi...
Found on
http://en.wikipedia.org/wiki/Rein-back

To back up; a two-beat diagonal gait in reverse
Found on
http://www.gaitedhorses.net/Articles/HorseGlossary.html

When a horse moves backward with the hooves being set down almost simultaneously in diagonal pairs.
Found on
https://www.encyclo.co.uk/local/22478

The horse moves backward in a straight line by moving legs in diagonal pairs. This is a two-beated movement. View Video
Found on
https://www.encyclo.co.uk/local/22480
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