i learned how to do them on my invaders last year, what i did was do 180s just skiing down then i would start to just touch my tips on the snow when i did them. after i got comfortable with that, i would start to do the 180 but keep my tips on the ground, and eventually i would lean into them. i have chronics now and i can butter them. once you learn them on a soft ski you can do them on anything. and im light too, 5'10" 135 and riding 181 chronics.