#60 Two Free Ways to Improve Sleep Quality, CO2 Tolerance Tests, Improve Your Focus
Becoming Ronin
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The Art of Breathing
The goal is to figure out how long you can hold your breath before there's a urgency to inhale. Brian McKenzie has an online breathing course and a certification. You could get real crazy with it and bring it into your training where you're doing some type of activity, such as pushups or prowler runs.
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