two-beat gait of a horse in which the feet are lifted and strike the ground in diagonal pairs—the right hind and left fore almost simultaneously; then the left hind and right fore. As the horse springs from one pair of legs to the other, twice in each stride all of its legs are off the ground at once.

A rider astride a trotting horse either sits in the saddle and is bumped as the horse springs, or rises to the trot, to allow more weight to bear on the stirrups when one or the other of the diagonal pairs of legs leaves the ground. This latter action, termed posting, reduces the impact of the trot on rider and horse. Trotters are also tried in harness racing.

An extended trot, unlike a collected gait, allows the head and neck of the horse to extend forward. The passage, or elevated trot, and the piaffer, or trot in place, are variations of the three-gaited or collected trot.