There are a few ways that your Apple Watch tracks your movement and, therefore, helps you stay on track with your move goal. First, you can start an activity. It's important that you do this if your arm isn't continuously moving (as Apple states, if you're pushing a stroller, for example). The other way that your Apple Watch tracks your movement is with, well, movement. As your arm swings, your Watch acknowledges that movement and logs it toward your move goal.