The breed exhibits a natural ambling gait, called the single-foot, which replaces the trot seen in a majority of horse breeds. Both gaits are an intermediate speed between a walk and a canter or gallop; ambling gaits are four-beat gaits, whereas the trot is a two-beat gait. The extra footfalls provide additional smoothness to a rider because the horse always has at least one foot on the ground. This minimizes movement of the horse's topline and removes the bounce of a two-beat gait, caused by a moment of suspension followed by the jolt of two feet hitting the ground as the horse shifts from one pair of legs to the other. The value of an intermediate speed is that the horse conserves energy. More than thirty horse breeds are "gaited," able to perform a four-beat ambling gait, and some can also trot.