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You can "swim" in space by pushing against the air. Not very well, but you won't get stuck.

Please enjoy these very confused birds flying around in a vomit comet:

https://www.youtube.com/watch?v=w4sZ3qe6PiI

I was imagining a standard 3D lattice of struts that could be configured however you want - as equipment mounts, wall studs, etc. They don't need to take too much load so the lattice itself could even be modular in my mind.

If you're wearing clothes, you can remove them and throw them to produce some delta v.

Always keep a tungsten cube in your pocket!

https://thume.ca/2019/03/03/my-tungsten-cube/

Filming what happens next has often been proposed as a great revenue driver.