Probably the first order of affairs for a logical analysis of gait and the anatomical mechanics of the racehorse would best be served by examining the gait itself. The Thoroughbred may be considered to have two gaits of speed: the slower transverse gallop as seen in morning gallops and the transverse run seen in morning speed works or actual races. One will also have a rotary gallop which will be seen occasionally in the racehorse, mostly in the first few strides out of the starting gate or in lead transitions. This distinction in the speed gaits were first studied and analyzed by number of men, but Eadweard Muybridge's photographic studies provided the foundation for all. John Henry Walsh (pseudonym: Stonehenge) suggested that the canter was a distinct gait from the gallop and so it tis, but probably not for the reasons he suggested. Edward Anderson in his 1883 text, The Gallop, went further to suggest that the Muybridge photographs commissioned by Governor Stanford showed the canter, gallop, and run to be three distinct gaits. He wrote that the run is so dissimilar from the gallop that they could never be observed as identical. He viewed the differences in rhythm, action, and sensation of those two gaits as prove of this premise. He describes one stride of the run as:
The Transverse (diagonal) Gallop and Run:
The horse leaves the ground from one of his forefeet (fig 1), resulting in all legs cramped underneath the body in open air suspension (fig 2), then receives the weight upon the diagonally disposed hind-foot (hence the name, the transverse gallop) which is planted 4' or more beyond the initial forefoot impact print (fig 3).