Wide-grip lat pulldown:

Wide-grip lat pulldown

The starting position is the same as in the wide-grip pulldown behind the neck, the only difference is that instead of bringing your torso forward you will bring it back (creating a curvature on your lower back) so that the bar comes in front of you. Now, as you exhale, bring the bar down until it touches your upper chest. Now, as you inhale, slowly raise the bar up, returning to the starting position.
That is one repetition.