You might like this. I was listening to Dr. Melissa Ilardo on Huberman, where she spoke about the Bajau Laut, indigenous sea people from Malaysia, Indonesia, and the Philippines, who live on the water and have evolved extraordinary spleens. They can dive 70 meters deep and hold their breath for over 5 minutes.

Another incredible diving culture is the Ama, a group of Japanese women, some of whom still dive well into their 70s and 80s. They’ve practiced breathwork since young (isobue whistle). And live a very long life.

Apparently, breath-hold diving activates the mammalian dive reflex, the same one triggered by cold water immersion. It lowers your heart rate, conserves oxygen, and works like a built-in cardio meditation.