"As you come across the top of a bump, you have to get your upper body over the top of your uphill ski, which will quickly become your new downhill ski. Everyone does this when they’re skiing normally. When you’re doing a GS turn, you have a lot of time to do it. In bumps, this move needs to happen so much faster."
Any lateral drills you can do—on dry land or on snow—will improve your quickness. “I used to jump side-to-side up stairs. It’s relatively low-impact, which isn’t ideal, but it forces you to squat down and suck your knees up. We also used to practice short-swing turns on the flats until we were blue in the face.”