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To kill a shuttle in the forecourt area you need to approach the net with your racket up, so that you can come from above the shuttle in order attack it. The key to an effective net kill is to use a short sharp action and to squeeze the fingers on the grip on impact. In the forecourt area you do not have time to take big swings at the shuttle.
A simple hand feed can be used to master the technique. For forehand kills the grip is such that the palm faces the net to open up the racket face. For backhand kills the thumb needs to be placed across the back of the handle to help control the shot. To refine technique and check that the player is using a short action, a faster hand feed can be used