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A comment on The physiological effects of slow breathing in the healthy human. Parent comment
Edit: found it:
Watch "How To Perform the 4-7-8 Breathing Exercise | Andrew Weil, M.D." on YouTube
https://youtu.be/YRPh_GaiL8s
Edit: found it:
Watch "How To Perform the 4-7-8 Breathing Exercise | Andrew Weil, M.D." on YouTube
https://youtu.be/YRPh_GaiL8s