how real is this claimpic.twitter.com/vwYgLVlRmB
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Seems like a classic case of one of those things that may or may not be adaptive, depending on your lifestyle, its fit for you, and your commitment to it.
I recall reading an article by some European doctor who worked in Africa about how sleeping on the ground (moderately hard) helps keep the spine healthy because the motions of breathing put the vertebrae back where they should belong. Can't find it atm though.
[Candide's brain: hey man, I finished running the query!] Here it is:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1119282/ …
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