We can handle sweltering summer heat, rough surf or chasing after the kids. What we don't have time for are fussy swim bottoms. When we're lunging for volleyballs, SUP racing or jumping off cliffs, we need swim bottoms that stay put through every dig and every dive.
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The swim bladdergas bladderfish mawor air bladder is an internal gas-filled organ that contributes to the ability of many bony fish but not cartilaginous fish  to control their buoyancyand thus to stay at their current water depth without having to waste energy in swimming. Additionally, the swim bladder functions as a resonating chamberto produce or receive sound. The swim bladder is evolutionarily homologous to the lungs. Charles Darwin remarked upon this in On the Origin of Species.
Splashing, wading, and paddling — it must mean a great day in the water. Playing at the beach, at a water park, by a lake, or in a pool can be a real treat on a hot day. Swimming is a lot of fun, but drowning is a real danger.
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While it is dangerous to hold your breath for too long underwater, you can stay underwater easily with thorough preparation. To stay underwater in a swimming pool, start by wrapping your arms around your legs so your knees are against your chest, which will help you sink. Then, slowly release air bubbles through your nose so you sink deeper into the pool.