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The backhand net flick should be struck in front of the body with a backhand grip.
You need a good solid lunge and early impact with the shuttle at the net to be able to play the flick well.
The flick should be a short action using the wrist with the arm extended forwards.
Squeezing the thumb and forefingers on the racket handle when striking the shuttle will to help generate more force to flick the shuttle to the rearcourt tramlines.