Swing out and turn around at the front end. Over the platform, bring your feet up in front of you and place the front of your feet against the bar. You can either bend your legs or keep them straight (you may find you can achieve more rotation with bent legs).Before you reach the peak at the front end 'break' from your folded position and sweep your legs back behind you until they are above your head and your body has risen over the bar. Let go of the bar and let your legs rise up straight behind you before tucking for the double somersault. Make a half twist as you come out of the somersault to catch.
You can find out more about this trick in my books:
Thanks to Michael Viau and Pneumatic Arts (@pneumaticarts) for providing videos for this page.
IMAGE CREDIT: Pneumatic Arts, @pneumaticarts