Your astral body activates upon moving to the fourth density of existence, this is the green ray (heart chakra) body activating. You currently inhabit the yellow ray body; also an energetic projection into a reality which is seemly physical but proven to be energetic. Attempting to free the astral from your physical body causes a thought form manifestation of a body which you end up believing is an astral body.
This video provides step by step instructions on astral projection the easy way.
How to Astral Project for Beginners STEP by STEP: The SUPER EASY WAY
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