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To develop your punch clear technique and deception, you can practise the shot interspersed with other overhead strokes.
Here, you can see Donna Kellogg in a routine playing a normal clear, a punch clear then a drop shot.
You will see she has the same build up for each shot and holds her overhead stroke racket position for as long as possible to create an element of deception.
It is important to have some deception for your punch clear because there is a danger of your opponent intercepting the shuttle early if they read this flatter shot.