A wide grip tends to work the upper, middle and outer area of the back. Start with the arms straight, with the weight hanging in front of you and the back in a pre-stretched position.
Concentric contraction: Breathe out as the bar is lifted and pause.
Eccentric contraction: Breathe in. Lower the bar with control (2-4 seconds) until the arms are straight and the back is in a stretched position. Repeat until the desired number of repetitions is completed.