How to pose skeleton-less ragdolls?

So I downloaded a few ragdolls off of, and when I go to pose them they’re extremely limp and they just flop around like a pile of skin.

How am I supposed to pose that? (Example of what I’m talking about: )

You use the physics gun and click on a limb, then you drag it into place, freeze and then select the next limb you want to pose.