This rural sports activity is practiced with animals (cows and bulls in particular), the object being to get the livestock to drag a weight over a terrain in the shortest time possible. The weight differs according to the category, ranging from 600 to 800 kg for cows and 800 to 1,100 kg for bulls, as measured in the yoke.
The skill of the handler, who is known as the guayero or boyero, the strength of the yokes, the conditions of the terrain and the treatment of the animals, which may not be punished either during or after the competition, all contribute to the unusual beauty of this sport in which both man and beast participate.