Split position started at frontend
Swing out from the platform. At the frontend, lift your legs towards the bar and pass a single leg through your hands, placing the sole of that foot on the bar. The other leg should be held straight with the front of the thigh against the bar. At the backend, push your head back and your hips forward and keeping the bar on the thigh of the straight leg, straighten the other leg. At the peak, let go and drop to the catcher.
You can find out more about this trick in following books: