I’ve gotten up to five minutes with these tips:
1) Practice. Practice taking big breaths practice staying underwater/holding your breath. The trick is building lung capacity over a period of months/years.
2) No extra moving or thinking. Both of these things use up oxygen. I’ll try to drift in a pool in a zen state.
3) Hyperventilate/breathe deeply before starting. You want as much oxygen in your body as possible.
4) always have a buddy who is watching you and checking on you every 30 seconds or so. Don’t use so much zen that you don’t come back. Know your limits. I haven’t tried it in a while because I would get killer headaches. If I tried right now I doubt I will get much past three. I made it to five, said “this is seems dumb to me” and stopped at that point.
5) get rid of your carbon dioxide a little at a time.
Latest Answers