How do you get a thick atmosphere with less than earth-like gravity?

Basically: I want a highly viscous atmosphere but I want people to be able to walk around. I was thinking earth's gravity * 0.6 or similar.

I was thinking that an atmosphere of Sulfur Hexafluoride would work, but I don't know what that would imply as far as temperature or feasibility. I also know that it's generally inert, so there would need to be some more reactive gases in solution if there is complex life.

Ideal situation: men are too heavy to actually "swim" through this environment, but if they move their arms right after a good jump, they'll be able to go pretty far. And if they fall a couple hundred feet it won't kill them.

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How do you get a thick atmosphere with less than earth-like gravity?

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