Tbh is that long even possible?
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Practice. I do a decent amount of snorkeling, so when I dive to the bottom holding my breath is important for staring to asser dominance over the fish. Start by hyperventilating then set a stop watch on your phone I bet you can pretty easily hit one min. By practicing you will certainly hit two. I just did two mins but my lungs were starting to spasm so work through that. Be calm, limit Oxygen consumption by your muscles and practice. For more than about 3 mins you need to breath pure Oxygen beforehand, it’s bad for you though so don’t make a habit of it.
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