Sentence:  The toelt is comfortable for the rider because the amplitude of the dorsoventral displacement is lower than at the <WSD>trot</WSD>....The slow <WSD>trot</WSD> is a two-beat symmetric diagonal gait. Among the normal variations of the <WSD>trot</WSD> of saddle horses, the speed of the gait increases from collected to extended <WSD>trot</WSD>. 
Meaning of the word marked with <WSD> tags:  A gait of a four-legged animal between walk and canter, a diagonal gait (in which diagonally opposite pairs of legs move together).