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To create a spinning net shot the racket face needs to make contact underneath the shuttle and move across the base of the cork.
Finger and wrist movement create the spin rather than arm movement. The aim should be to take the shuttle as early as possible with the arm stretched out.
Out-to-in spin is usually used when a player moves in a straight line to the shuttle after a shot on the forehand side.
In this case the spin is create by moving the racket out to in: for right handed players the racket head from right to left.