The energy movement, at its lowest, is subtle. The more you practice and increase flow, vitality levels, strength of will, breath etc.. the "heavier" the energy becomes. The ancient chinese text, the secret of the golden flower, explains it as the energy crystalizing. I think blockages are formed when crystalized or heavy energy is gathered into a spot to prevent more subtle energies from passing or flowing. The text can be found on wikkipedia for free.
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