[cjameskeller]

Sort of, but it generally goes more like: base/perineum, genitals, navel, heart, throat, forehead, and then one at the top of the head or just above. The Sefer Yetzirah, however, references specifically "Head, Belly, and Chest" as the three loci of the human body. (§ 3.4-5)

[hinkley]

There's a healthy debate about whether the dantien is below the navel being mistranslated as near the pubic bone versus three inches toward your spine, either in your viscera or in the lowest layers of muscle in your abdominal wall.

[andsoitis]

If it is real and people experience it, how is it a mystery where it is located?

[hinkley]

We don’t know if we are experiencing the same thing.

Ultimately, muscle guarding can be bad for your health. I can only agree that I’ve experienced muscle unlocking, and the visualizations associated with that concept definitely facilitated that. I can’t say much beyond that. But I’m sure I could find you people who would happily jump to conclusions.