Kicker BS 900.

1. Approach the kicker straight on with plenty of speed.

   A backside 900 is two and a half rotations, so first make sure a larger kicker gives you the height and air time you need.

2. Just before the lip, wind your upper body slightly the other way (toward the frontside) to load up.

   Keep your chest and eyes facing downhill and set your rear shoulder (the shoulder over your back foot) to swing forward. That stored wind-up is what powers the spin off the lip.

3. Off the lip, extend both legs to pop straight up, and at the same moment unwind your upper body backside, pulling your rear shoulder back to start spinning.

   Pop with the legs first, then the shoulders, so the spin lines up around a vertical axis.

4. Once the board leaves the snow, hug both arms to your chest and pull your knees up to make yourself small.

   All your spin speed is set the instant you leave the lip and can't be added in the air, so the tighter you tuck, the faster you rotate on the same amount of spin.

5. Spinning backside, you briefly face away and lose sight of the landing.

   Your view is cut off twice: from just after the pop until just short of one rotation, and from past one and a half rotations until just short of two. Through these sections don't crank your neck around; just hold the rhythm and ride through them.

6. Past two rotations, lead with your head toward the direction of travel and spot the landing slope with your eyes.

   The rough timing: pop → half rotation facing away → one rotation sight returns → one and a half facing away again → two rotations sight returns → two and a half lands.

7. Once you see the landing, open both arms out to the sides and extend your knees to slow the spin and stop it at two and a half.

   Spreading your arms makes you bigger and slows the rotation, so fine-tune your landing direction with how wide you open.

8. Land switch (riding the opposite way to normal) with your weight stacked right over the board.

   If your body stays back you'll get bucked, so brace your core at touchdown and keep your chest over the board.

You can pin your own clip to the tricks you've landed (My Video).