Set-up: Find either a dual-pulley cable machine or twin cable towers, and grasp the handles adjacent to one another at or below hip height.
Movement: Without letting your shoulders or shoulder blades round forward, and with a slight bend in the elbows, pull the cables apart to your sides until both arms are parallel to the floor. Do not use momentum or swing your body. Return the cables to the start position under control.
Emphasis: Keep your back neutral and core braced, do not swing.