Also known as: Whip Ecart, Set Straddle Whip

Swing out with your hands close together. At the frontend, lift your legs up in front of you and place the soles of your feet on the bar, either side of your hands (a frog-like position) with your butt up close to the bar. At the backend, straighten both legs, keeping them apart and fold your body with your head forwards. At the front end, let go and unfold to 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: