If you don’t want a V-shape right now then you should! Creating the “V” shape with your back muscles can actually create an optical illusion, making you waist and your hips look smaller. What woman doesn’t want that!?? By focusing on your posterior delts you can create the V-shape that every woman should have.
Set Up: Adjust the seat so that your arms are parallel to the floor during the entire range of motion. Press your chest against the pad, reaching forward to grasp the handles with your palms facing each other. Your elbows should be bent slightly and kept that way throughout the execution of each rep. Retract your scapulae before starting and keep them retracted throughout the set.
Action: Leading with your elbows, not your wrists, pull the handles in an arc toward the rear as far as possible. At the rear, pause briefly, squeezing the rear deltoids, then slowly return to the starting position.
Tip: To correctly train the small rear shoulder muscle, avoid dropping your elbows as you rep (source).