Everything I read about this is inconclusive. We have an entire industry dedicated to removing knots (massage), but know one seems to be able to say exactly what they are.
In: Biology
They are spots and areas of your muscle which have hardened due to bad posture or inactivity (says google). [https://www.medicalnewstoday.com/articles/321224](https://www.medicalnewstoday.com/articles/321224)
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