The boleo ( a type of throwing/swiveling action)
that gauchos do with their boleadores is an embellishment caused by the 'whip' action of the follower, executed when an ocho is quickly reversed in the middle. The follower's free foot is thrown to the side and wraps around her leg at the knee. It is considered an embellishment because the follower forces her pelvis to disassociate from her upper half during the rotation, allowing her free leg to be thrown up and around in a decorative flourish. It should be noted that the actual whipping action of the leg during a boleo is called the latigazo (lash).
There are two variations of the boleo: back and front.
BOLEO PARA ATRÁS (BACK OCHO)
The change in rotation results in the backward, swinging action of the free leg.
BOLEO DE FRENTE (FORWARD OCHO)
The change in rotation results in the free leg wrapping around the front of the supporting leg.