The first additional gait is a four-beat lateral ambling gait known as the "tölt". This is known for its explosive acceleration and speed; it is also comfortable and ground-covering. There is considerable variation in style within the gait, and thus the tölt is variously compared to similar lateral gaits such as the rack of the Saddlebred, the largo of the Paso Fino, or the running walk of the Tennessee Walking Horse. Like all lateral ambling gaits, the footfall pattern is the same as the walk (left hind, left front, right hind, right front), but differs from the walk in that it can be performed at a range of speeds, from the speed of a typical fast walk up to the speed of a normal canter. Some Icelandic horses prefer to tölt, while others prefer to trot; correct training can improve weak gaits, but the tölt is a natural gait present from birth. There are two varieties of the tölt that are considered incorrect by breeders. The first is an uneven gait called a "Pig's Pace" or "Piggy-pace" that is closer to a two-beat pace than a four-beat amble. The second is called a "Valhopp" and is a tölt and canter combination most often seen in untrained young horses or horses that mix their gaits. Both varieties are normally uncomfortable to ride.