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a brown-skinned woman swimming with a baby on her back and one near her, with a tree and some grass

Caribbean woman swimming with two children

Your own lungs still can act a little like swim bladders. When you go swimming at the pool or in the ocean or a lake, try taking a deep breath and floating while you hold your breath. Then try blowing out all the air, and floating.

Which is easier? Do you float higher in the water with your lungs full of air, or empty? Does it matter how long you hold your breath?

Find out more about breathing
History of Swimming

Bibliography and further reading:

Respiration

Biology
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