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its a common feeling from qi building - [https://www.shaolintreasurehouse.com/blog/what-does-qi-feel-like#:\~:text=Here%20are%20some%20common%20Qi%20sensations](https://www.shaolintreasurehouse.com/bl…

daoism talks of the heaviness as one of the '8 touches of qi' - https://www.wisdomlib.org/definition/bachu#:\~:text=of%20flying.%0A4.-,Heaviness%20Sensation,-(%E9%87%8D%E8%A7%B8%20%5B vibration is al…

these are common sensations of qi/prana. There are systems that work to clear/purify & build/nurture it. These are spiritual systems, also in modern times some people just do the earlier stages of pra…