Embrace (abrazo)
A striking difference between Argentine tango and ballroom tango is in the shape and feel of the embrace. Ballroom technique dictates that partners arch their upper bodies away from each other, while maintaining contact at the hip, in an offset frame.
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In Argentine tango, it is nearly the opposite: the dancers' chests are closer to each other than are their hips, and often there is contact at about the level of the chest (the contact point differing, depending on the height of the leader and the closeness of the embrace). In close embrace, the leader and the follower's chests are in complete contact and they are dancing with their heads touching or very near each other. In open embrace, there can be as much space as desired between the partners, but there should always be complete contact along the embracing arms to give optimum communication. Since Argentine tango is almost entirely improvisational, there needs to be clear communication between partners. Even when dancing in a very open embrace, Argentine tango dancers do not hold their upper bodies arched away from each other; each partner is over their own axis. Whether open or closed, a tango embrace is not rigid, but relaxed, like a hug.
Walking (caminando)
One very important characteristic of Argentine tango is the walk outside of the legs of the lady. The inside walk belongs originally to the American Tango. It is seen in Argentine Tango, but it does not belong to it originally. Another difference is that the leader may freely step with his left foot when the follower steps with her left foot. In English, this is sometimes referred to as a "crossed" (e.g. "walking in the crossed system") or "uneven" walk in contrast to the normal walk which is called "parallel" or "even." In ballroom tango, "crossed system" is considered incorrect unless the leader and follower are facing the same direction. Furthermore, the flexibility of the embrace allows the leader to change his weight from one foot to another while the follower's weight remains unchanged. This is another major difference with ballroom tango, where a weight change by one partner leads to an automatic weight change by the other.
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The nomenclature originated with the Naveira/Salas "Investigation Group." Early on, they used 'even/uneven' to describe the arrangement of legs in the walk (or turn). By the mid-1990s, they began using 'parallel/crossed' and later 'normal/crossed'. In dance the changing of feet is named contrapaso, or "contra-step". This change can be made off or on the normal beat.