Barrel racing is an event often seen in rodeos. It involves a rider and horse going around 3 barrels in a cloverleaf pattern, started on either the right or the left side, but more often than not, the right side. Riders go from one barrel to the next making a circular pattern around each and then running back past the timer in want of the fastest time.
Images for kids
Barrel racing at the Calgary Stampede
Barrel racing Facts for Kids. Kiddle Encyclopedia.