Circular breathing is a simple technique akin to walking meditation where breathing in a certain way brings one back into alignment and the flow of prana (life force).
I could explain this meditation, but I have been reading “Living in the Heart” by Drunvalo. I highly recommend that you read this book to learn the technique of circular breathing.
ps. thank you to my readers, sorry for my absence as of late. The ebb and flow of words is connected to the ebb and flow of life.