Belly breathing is simply normal breathing but instead puffing up your chest to breath, which is what you do when you need a large amount of air in there quickly (like exercising)…
Your body takes a more relaxed approach (literally) by relaxing your core muscles.
This allows your diaphragm to expand downwards towards the area where your stomach would usually sit which creates the negative pressure in your lungs that we use to draw in a breath.
Breathing is controlled by your diaphragm.. imagine it like the bottom of a sack.
If you make the sack bigger, more stuff (air) can fill it and if you then shrink it, the stuff inside spills out.
The diaphragm simply does it using pressure difference on either side of it.
Your innards move down creating a negative pressure in your stomach cavity, which pulls your diaphragm downwards, which creates a negative pressure in your lungs.
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