There were two types of horse races in Ancient Olympics. One used horses ridden by a single rider bare back. What was the other type of horse race?

The other type of horse race in the Ancient Olympics was the chariot race, where teams of horses pulled a chariot driven by a charioteer. This event was known as the "tethrippon" and was highly competitive, involving multiple horses and often leading to thrilling and dangerous contests. Chariot races were popular and showcased both the skill of the driver and the strength of the horses.