When referring to house dancing this word has taken on a slightly more specific and somewhat less sexual meaning. Jacking is a dance technique that comes from moving the torso forward and backward in a rippling motion, as if a wave were passing through it. When this movement is repeated and sped up to match the beat of a song it is called jacking, or "the jack." This technique is arguably the most important movement in house dance because it is the foundation that initiates more complex movements and footwork. Jacking has also permeated many other divergent forms of house and freestyle broken beat music and dance. Just as house music itself grew from the disco tradition, so too, did jacking's dance develop from the self expressive styling of disco dancing. Jacking is considered a freestyle dance.