Also known as: Single Knee Hang

Swing out. At the frontend, hook one knee onto the bar and keep your other leg straight with your head back. Swing back to the platform and as yuo return to the frontend, release your hands and lift your head to make the catch.

These notes are provided ONLY as an explanation of the trick.
If you want to perform it yourself - get an expert to teach you.
Other variants of this trick: