The face pull works the rear delts, traps and upper back. Having a strong back and upper shoulder section helps with so many other exercises. On this exercise it's best to use a longer rope handle attachment, as this will allow you to pull it wide and to the sides of your head. This movement should be smooth. As you pull it back flare your elbow out to the side to fully engage the back. Hold for a second and then slowly return to the start position.