To do a half-cabflip roll backwards in your normal stance. It is somewhat like doing a half-cab.Stand like your going to do a varial flip. As you roll back wards wind up so you would be looking at your back foot. Shift your weight to your back foot and pop the board and make it do a varial flip, do a body varial the same way the board does a varial flip. Stomp down on the truck bolts to land. You will be in your normal ollie position when you roll away except you will have both your feet on the truck bolts. Roll away smooth.