I'd say you're a 4min breatholder already- you just don't know it yet! Do some dry statics on your back on the couch. Double the breathe up after each hold ie: 1st hold is 1 minute- breathe up for 2 min. Next hold might be 2 minutes- breathe up for 4 after that before the next one. Usually your 4th or 5th hold will be your max for the day.
There are other methods- use what works for you.
Be careful in the water- make sure there's a spotter.
Maybe post a thread in the California section to get some buddies?
Cheers and welcome,
Erik
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