Could there be an atmosphere in which I could both be alive and float?

There an atmospheres in which I can live, like Earth's. There are atmospheres in which I can float, like if it were a really heavy gas. Is there some atmospheric composition where I could both be alive and float, unaided?

By be alive, I mean I could survive until I run out of food or water. By float, I mean I can be above the ground with no effort (indeed, I probably couldn't control it.).

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Could there be an atmosphere in which I could both be alive and float?

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