Swing out and back to the platform. Instead of a normal set ('seven' position), lift your legs in front of you and hold them at 90 degrees. Swing down into the centre and as you reach the poles (centre of the swing) beat back as hard as you can with your legs. As you move up towards the peak at the frontend your legs will follow behind you and then move in front and up to the sky. Hold your body straight and let go at the peak, making a full twist in the air before the catch.
You can find out more about this trick in my books:
Thanks to Fly'n Fit Trapeze School in Japan for providing a video for this page.