Set-up: Find the pull-down apparatus and switch-in the rope attachment. Adjust the knee rests securely. Grasp both sides of the rope and establish a tight midsection and a neutral spine.
Lift: Pull the rope down until it is a few inches from your chest. Return the weight back to the starting position under control. As you pull, cue yourself to push your elbows down, which will increase involvement from the lats.
Emphasis: Do not swing - your back should move very little from the starting position.
Benefits: The primary target of the pulldown is the latissimus dorsi. While the middle back is also involved to a lesser degree in the exercise, the vertical nature of the pull tends to take the muscles of the mid back out of the movement.