shattasma

Also Wim also swam under a frozen lake in just a Speedo. Not to any significant depth but he did.

Read this book;

https://www.amazon.com/Breath-New-Science-Lost-Art/dp/0735213615

Here a couple review snippets;

This book is awesome. Most people have no idea how to do breathing exercises and how beneficial they are. Over the last few weeks I’ve been using the methods I learned from his book and I can tell you there are absolutely some real benefits to be had from this. . .I really enjoyed this book."
—Joe Rogan on Instagram

"I highly recommend this book." —Wim Hof on Instagram