[JoshMilo]

It was the training for freediving, although I grew up next to the ocean and have been swimming the majority of my life so I'm sure that plays a part.

What the article doesn't mention is most people can increase their lung capacity using several techniques like over-unders (pool drills where you swim across a pool alternating between underwater and regular),Oxygen tables, breathing patterns (think meditation), and working out while holding your breath (be careful with that one, I'd suggest just walking holding your breath first).

[oostevo]

I'm not about to try freediving without proper instruction, but some of those sound generally useful.

Can you share any good resources for training?

[JoshMilo]

Sure thing.

Breathing exercises: http://freedivingexplained.blogspot.com/2008/03/freediving-t... The "go to" forum for me: https://www.deeperblue.com/