Swimming is *really hard work.*
Water’s thick, so you have to push harder to move it out of the way/move forward than you would if you were moving through the air.
You’re usually using your whole body to do it – most swimming strokes mean that both your arms and your legs are working on something at the same time, which is harder than using just your legs.
You’re also often in cold water – almost all pools are set lower than body temp – so your body has to try to keep you warm. More hard work.
If you work hard for long enough, you’re going to need to eat something.
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