The trot is a ten-beat diagonal horse gait where the diagonal pairs of legs move forward at the same time with a moment of suspension between each beat. It has a wide variation in possible speeds, but averages about . A very slow trot is sometimes referred to as a jog. An extremely fast trot has no special name, but in harness racing, the trot of a Standardbred is faster than the gallop of the average non-racehorse, and has been clocked at over . On June 29, 2014, at Pocono Downs in Pennsylvania the Swedish standardbred Sebastian K trotted a mile in 1 minute, 49 seconds (quarters were passed at 26:2, 55:3 and 1,21:4). This is equivalent to a 1000-pace in 1.07,7 or 53.14 kilometers per hour or 33 miles per hour. From the standpoint of the balance of the horse, the trot is a very stable gait and does not require the horse to make major balancing motions with its head and neck. Due to its many variations, the trot is a common gait that the horse is worked in for dressage. Eadweard Muybridge was the first to prove, by photography, in 1872 that there is a "moment of suspension" or "unsupported transit" during the trot gait. Types Depending on the amount of engagement and collection of the horse, the trot can generally be classified as "working", "collected", or "extended". By the rhythm, one may distinguish a true, two-beat square trot when each diagonal pair of hoofs hits the ground at the same moment from a four-beat intermediate ambling gait, such as the fox trot or the "trocha" sometimes seen in the Paso Fino. Different speeds and types of trots are described by the following terms: Jog trot, as seen in western horses, is a slow, relaxed trot lacking the suspension of a working trot and with shorter strides. It is easy to ride because there is less "bounce". The head of the horse is carried low while the hindquarters are engaged and underneath the horse, and there is less impulsion than in a dressage-style collected trot. Collected trot: A very engaged trot where most of the horse's weight is carried toward the hindquarters. The frame is compressed and the stride length is shorter than any of the other trots with the horse taking higher steps. The horse is lighter and more mobile in the collected trot. Slow trot