Barrel racing
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 square pattern around each and then running back past the timer in want of the fastest time.
Barrel Racing Media
Diagram of a Barrel Racing Course. Riders enter at the red line, circle around the 1st barrel, proceed to the 2nd barrel, and then continue on to the 3rd where they will complete the pattern and finally exit the course crossing the red line a second time. This pattern is often referred to as a "Cloverleaf". The pattern may also begin with the left barrel first.