Answer: Chariot racing
Explanation: Among the most popular forms of entertainment in the Romans are gladiator fighting, the Roman box and the chariot racing. Although the Romans enjoyed these events, from the aspect of today's human standards, these activities were very cruel.
Certainly one of the most popular Roman entertainments and leisure activities was the chariot racing that was held in the Circus Maximus. Within the circus, there was an arena where chariot racing were maintained, which were very dangerous in the way of performance and competition. Considering the significance of these races, competitors drove chariots at high speeds, where participants often fell out, and were killed by horses or caught in the reins.