The UPRIGHT GO was designed to be used on your spine, to detect your back's movements.  

The GO can also be used in other areas of the back, although we cannot guarantee it will work as well.
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So, if you feel like you are sit upright, but your shoulders slump forward too much, here is something you can try out:
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Try placing the UPRIGHT GO between your shoulder and spine.  Play around with it until you find a spot that works best for you.  Then, calibrate the device when your shoulders are where you want them.