They don’t just sink, they try very hard not to sink, and untrained most people try to “climb” out of the water like they were on a ladder. That just doesn’t work and uses a lot of energy. Further the panic from getting water in their face/mouth from the splashing just makes it worse.
Swimmers normally don’t do any of those things. They in effect “fly” in the water with 4 wings known as arms and legs.
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