Switching up on skis, specifically in a frontside switch up, involves a similar motion to a frontside 270 out, focusing on dipping your heel once you're locked onto the rail.
Here's a breakdown based on the video clip (How To: Frontside Switch Up On Skis (Front Swap) - YouTube) :
- Approach: Come at the rail with enough speed to get on.
- Engagement: Get onto the rail and lock in.
- Initiation: This is key. Dip the heel to initiate the switch up. This helps rotate your body.
It is important to practice the frontside 270 out first, as the initial motion is quite similar. The heel dip is the key movement to ensure proper rotation.