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I have not heard of a meditation only practice in the upper body. However, breath meditation practice in conjunction with the stomach so they may consider upper body experience.
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Just modify the instructions accordingly. A proper body scan just involves probing and examining the kinaesthetic response from every cell your body, not just the skin, but internal organs and everything in between. You don't have to start with the feet or the head, you can start wherever you feel like, can stay as long as you want. But the more you can pervade your awareness to every cell in the body, the better results you're going to get in your meditation practice. The longer you work at it, years and decades, if you're serious about your practice and dedicate several hours a day to it, energy channels will open up and it will feel like you can sense every cell in body, even all of them simultaneously.