Finally, my time to shine, I went recently from 1 minute to 4 minutes!
First and foremost, their heart rate slows. Heart rate is basically proportional to the speed your body vastes oxygen. I went from 70 bpm to around 45 bpm during the period of my trainings.
Second, meditation like state. Your brain is the biggest energy waste in the body. By letting all the thoughts go away, you can really get a large boost of time you can spend without oxygen.
Third, lung capacity. Kinda obvious, but it also can change, and normally divers have larger capacity.
Fourth, understanding the signals your body sends you. When you start feeling that you need to breathe in, it’s around 1/2 of your total time. When you start getting convulsions in abdominal area it is around 2/3rds. Normally people would get afraid when their diafragm convulses, but for free divers it’s just a signal.
All these factors combined with training can get you to 4-5 minutes in a couple of months.
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