Title says it all. This is the official how to, for all tricks snowboarding.
50-50 Bs 180 out
Ride onto the box or rail like you would for a normal 50-50.
Keep your knees bent and hands at your side or pointed to your tip and tail.
Keep your eyes on the end of the feature.
Just before the end of the feature seperate your feet and your shoulders, turning your shoulders so that you are looking at the take off, but feet are still in a clean 50-50.
As you feel your front foot come off the feature, push your feet off your shoulders, so that when you land your shoulders, and front foot are now facing the feature.
If it is a larger feature look down at your snowboard right before you land to stop your rotation.