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An unexpected result from a seemingly harmless activity - holding one's breath underwater.
https://www.yahoo.com/news/watched-husband-almost-die-front-104525608.html
An otherwise healthy 27-year old man held his breath underwater, then his heart stopped.
It is surprising, since I used to do that in swimming pools, in competition with my brother, or just to see how far I could swim underwater before surfacing. I managed to swim two laps. My brother and I had contests to see who could hold his breath the longest, but we did that sitting in chairs.
https://www.yahoo.com/news/watched-husband-almost-die-front-104525608.html
An otherwise healthy 27-year old man held his breath underwater, then his heart stopped.
It is surprising, since I used to do that in swimming pools, in competition with my brother, or just to see how far I could swim underwater before surfacing. I managed to swim two laps. My brother and I had contests to see who could hold his breath the longest, but we did that sitting in chairs.