Hi Stevekemp,<p>Both watches which will be supported by the app have at least 3 axis accelerometers and 3 axis gyroscope, meaning the watch understands various plans on motion in relation to is position on earth and can track those movements very accurately.<p>Given the exercises you&#x27;re using in your example, squat and over-head press, the wrist will travel through a specific plane of movement (when done properly) for each exercise respectively.<p>For example, Stand up and put your hands up as if your holding the barbell on your back, as you would in a squat and perform a proper squat....straight up and down.... Now tilt forward to curve your back as you describe in your comment and do a squat... Did you notice that you&#x27;ve now changed the plane of movement your wrist traveled between the proper squat and &quot;bad form&quot; squat?<p>This is how the app would work and though that may seem like subtle difference in the wrist to you and I, to these motion sensing technologies, its a major difference that can be detected.<p>Thanks for the great question and hopefully this helps!!