Breath rhythm is one of the few parts of the autonomic nervous system we can reach on purpose. Change how you breathe, and you send a direct signal to the vagus nerve about whether it's safe to rest.
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Hear a calm cue at the start of each breath phase.
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Why this works
Box Breathing
Box breathing gives the nervous system a predictable rhythm, which reduces sympathetic activation and helps the prefrontal cortex stay online during stress.