Originally Posted by
Scott Ray
There's a technique we use in scuba diving and free diving called "packing". It's essentially lung stretches. It can make a difference very quickly. It will blow your mind how much your cardio can improve in like 2 days, even after just the first session...seriously. I was taught it by a the natives of the Cayman Islands on one if my diving trips. I have never looked for literature or instructional videos of it, but I'm sure it's out there.
Overdistention causes barotrauma, permanently damaging the lungs. I would recommend against it.
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