Ski BS Slide.

1. Approach the box or rail straight on at a slow, controlled speed that's just fast enough not to stall.

   Keep both knees softly bent and both ski bases flat on the snow so neither edge catches.

2. Just before stepping on, sink through both knees and ankles, then spring up lightly so the skis lift just off the snow.

   You don't need a big jump, only enough air to reset them sideways.

3. While the skis are light, turn your hips and both skis 90 degrees the opposite way from your FS slide.

   Keep your head and chest pointed down the box and watch the far end over the shoulder on the travel side. It's the unfamiliar direction, so send your eyes ahead first or it feels scary.

4. Set both skis fully sideways across the box.

   The foot that leads in the direction of travel is the opposite one from your FS slide. Keep both bases flat and your weight even and centered over both skis, right under the arches of your feet.

5. Slide sideways with your pelvis stacked directly over both skis.

   Hold a twisted stance with your upper body facing down the box and only your lower body turned sideways. Keep your eyes on the exit the whole time.

6. As the end of the box nears, lead with the head and chest you kept facing forward, turning them back to square first, and let that momentum bring your hips and skis 90 degrees back.

   Think of turning back only 90 degrees.

7. Once both skis face forward, soften both knees and ankles to absorb the landing and ride away.

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