The ritual and sporting activity played throughout pre-Columbian Mesoamerica, especially in Mexico and Guatemala from the Pre-Classic period. (Stone reliefs at Dainzu and the possible remains of a ball court at San Lorenzo Tenochititlan indicate that the game existed as early as Pre-Classic times.) It may have originated among the Olmecs (La Venta culture, c 800-400 BC) or even earlier and it spread to other cultures, including Monte Albán and El Tajín; the Maya (called pok-ta-pok); and the Toltec, Mixtec, and Aztec. In Aztec times, it was a nobles' game and was often accompanied by heavy betting. Various myths mention the ball game, sometimes as a contest between day and night deities. It is still played in isolated regions. The players, who were sometimes heavily padded, were allowed to use only their hips and thighs in propelling a rubber ball around the court. The ball-court itself was shaped like a capital I with exaggerated end pieces, and in the Post-Classic period stone rings or macaw heads were fixed to the side walls. Aztec records say that the team which passed the ball through one of these rings won the game outright. Tlachtli is the name of the court itself, but also for the game. Tlachtli and ollama are Nahuatl words. There was considerable diversity in the rules both over time and across culture. Death through injury was not unusual and the loss of a game could sometimes result in the sacrifice of the losing team. There is a considerable inventory of artifacts associated with the ball game, including hachas, palmas, court markers, elbow stones, and yokes.