Replying to Jib terms (en français)

Okay, here`s the deal: I have to give a presentation on newschool skiing (don`t ask). BUT I`m doing it in French. The problem is I don`t know all of the vocabulary Francophones use to describe jibbing rails etc.

Can someone help me out with the expressions/words used for:
sliding a rail
grinds
down-kink
switch on/off
disaster
nosepress
the different types of features (e.g. boxes, c-rails, s-rails, coasters, etc.)

I think you get the idea. Any help would be appreciated.

Merçi.