[tr352]

On a slightly unrelated note, "Kiiking", a sport that was invented in Estonia and that hasn't reached much popularity elsewhere, looks like a lot of fun. It's definitely something I want to try one day. https://en.wikipedia.org/wiki/Kiiking

[presidentender]

That looks incredible.

I don't see any safety restraints, though - sort of a "hold my beer and watch this" situation.

[dspillett]

The Wikipedia text states

    A person is fastened to the swing base by their feet.

so unless there is a major equipment failure or your stomach decides to rebel all should be fine.