A useful exercise is to practice making a powder turn in 2 or 3 separate movements – part one, turning your skis just to the fall-line and parts two & three, turning them uphill and then turning them to a stop. Practice this on a gentle slope in shallow powder. Another useful exercise is to link a series of powder turns, slowing up and almost stopping at the end of each turn.
This Video Tutorial is from the “SkiTips 3” App for iPhones and iPads and from the “Powder and Off-Piste Skiing” eBook, both available on the Apple AppStore.
Off-Piste & Powder Skiing