Here Tamori san shows the most common mistake that skaters make on a Salchow or double Salchow. When you fall outside the curve on a jump, it is because of one of these two reasons that tend to happen together, but not always. We want to isolate motions in sports. In the case of the Salchow, the two legs do entirely different actions. We want most of the rotational momentum to be in the free leg on the take-off edge. This is an action of the free hip.