Originally Posted by Dr.Skinny
Our instructor emphasized turning on the tops, pressuring the tips when coming down from the top of the bumps (don't know if this is the front-side or the back-side -- those terms always confused me)
Think of it like peddling a bicycle backwards. You pressure the tips to get them down the bump. Or put another way: you are trying to re-extend your legs after absorbing the bump, to keep your skis on the snow surface.
I'm sure some of the other guys here could explain better than I just did, but I thought I would try to help.