: Documents often explain the Pranamaya Kosha (the vital energy sheath) as the bridge between the physical body and the mind.
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While I couldn't find a direct link to a free PDF version of "The Power of Prana" by Yogi Bhajan, I can suggest some alternatives:
Prana is often described as the vital energy or life force that animates the body and mind. It's the energy that flows through the nervous system, fueling physical and mental activities. Prana is also associated with the breath, as it's believed that the life force enters and exits the body through the breath.