To perform the basic variation set yourself up parallel to a cable machine. From here, take a step backwards so that when you extend your arms your hands are aligned with the machine. Grasp the handle with both hands and bring them to the center of your chest. Bend your knees and keep a balanced position throughout.
Now, press your arms out straight ahead and then bring them back in to your chest in a controlled manner. You'll notice that the further the resistance gets from your body the harder it is to resist rotation and stabilize your core. The video below shows the proper set up and tempo.