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Gotta breathe! Look up Wim Hof, otherwise known as the "ice man". He's got good breathing exercises to handle cold dunks better.

I love me some Wim Hof. Would love to meet the guy and dedicate time to the type of training on myself. He had a great appearance on Joe Rogan not too long ago, had a beer, talked crap about his son, very funny stuff, really positive guy.

I think that was what spurred me to learn more about him. Seeing Joe hold his breath for so long blew my mind!