That's bad advice. If you fill your lungs with water, you'll float better because now your lungs' densities will be the same as the water, preventing you from sinking. So you need to breathe in all the water you can.
The human body is technically buoyant on its own. That's why corpses tend to float. If you are in relatively calm water, don't struggle and splash around, just relax and float.
especially bigger people. Fat floats so it's generally easier for bigger people to float on their backs without any problems. I'm overweight and bigger than my brother and my brother always struggles with floating in the pool whereas I have no issues with it.
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