i can understand in ‘through the nose’, since dust and other bits can be blocked by the nose hairs and mucus, and apparently the air is more likely to warm up when passing through the nose first, reducing irritation of the throat.
but what difference, if any, does exhaling through the mouth make?
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You don’t state which breathing techniques you refer to — the breathing technique for swimming is very different from that of giving birth or meditation.
There are some differences in the biomechanics that others have mentioned — in some cases improving the natural reaction like timing breaths to movement, and in others avoiding the natural but harmful reaction like hyperventilation in pain — but for an alternative or rather an _additional_ answer, I’d say that a big reason is that it makes it easier to be mindful of your breathing. It gives you a better capability to apply a technique to breathing than just breathing through your nose does.
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