Then it gets a little tricky as you are going blindside for the last 90 degrees. As you spin look to it that the axis of the spin corresponds with the angle of the down rail, since you want to land flatbased on it.
If you land on the toe edge, the board will slip out underneath you. You land on your heel edge, it will be carnage. Try to land centered on your board and keep your knees bent to cushion the landing on the rail and for balance.
Ride it out and be stoked!
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Now check out Simon's walkthrough of Frontside 180 to switch 50-50s while you're at it.