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How to stop when skiing
With your skis pointed in the direction of motion, start to spread your legs slightly, giving yourself some room between your skis.
Move your ankles and change your weight distribution to put pressure on the inside of your feet.
This step allows the inside of your skis to start to grip the snow and form an edge.
Simultaneously with transitioning onto an edge, start to point your toes inward toward each other. This is what gives your skis a wedge shape.