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A simple way of practising the forehand slice cross-drop is a continuous rally with one feeder lifting to the forehand rear court area while you groove the shot.
Remember to make a recover after playing the drop, as you wouldn’t stand waiting for the shuttle in a game situation.
To progress this practice and the range of movement, the feeder can start with a push shot to the midcourt which you return for them to lift the shuttle to the forehand rearcourt. From the lift you have a target to aim for with your forehand cross-court drop.