I highly recommend everyone look into Wim Hoff's work. It's not only helpful but he's also a super interesting guy.
https://youtu.be/JPPlicAEFec?t=3058
Four rounds in a row first thing in the morning blows coffee away by a long shot.
And the free app to make it easy to track progress: https://itunes.apple.com/us/app/wim-hof-method/id890471578?m...
I had to stop when the Russel Brand was trying to explain that the mediation quieted the narrative in his head. Hof attempted to finish his thought in exactly the wrong way, then pulled a 180 upon being corrected. Really had the feel of that guy in the mall trying to sell you hand cream...
Go read the clinical study. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4034215/
Look up his list of Guinness records. Marathon in the desert. Climbed nearly to the top of Everest in shorts and no shirt. World record for longest breath hold underwater. etc.
Only someone who feels strange would even think to try these things.