This "Tom Sietas" approach has been used for my brother for the last 3 years. His last time was 8:48 with 2 previous breatholds of 7:30 and 8.
I have found that the contractions comes very early but are more "confortable".
I do believe that we most train close to our maximal, in order to induce adaptation.
I donīt think that a row of static apneas of 3 min will make any change in your body
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