Breath holding

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Breath holding, or apnea, is a practice associated with underwater activity without breathing equipment. It can also be practiced above water. This is called dry apnea. I must warn you that underwater apnea is more dangerous than dry apnea because if you breathe underwater from passing out you can die while on land you'll get air.

make sure you read up on breath holding for more information on a site like this or anywhere you'd like. Educating yourself is very important. Also try to relax when you hold your breath to conserve oxygen.