First off, I'm very new myself - I'm only up to 1 minute 33 seconds static apnea in the pool. But I personally found that a good way to get past the one minute mark, at least with static apnea in a pool, is to relax and not look at the clock obsessively. I'll occasionally signal to my buddy to let them know I'm okay, or sometimes my buddy will signal to me every 30 seconds so I can pace myself.
Hope that helps. Maybe someone more experienced can chime in and give us both some useful advice.
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