Service: The first forward movement is to hit the shuttlecock . Yes, you are correct. It is the one forward movement which is important. Most server hold the racket head IN FRONT of the shuttlecock initially. Therefore, he/she will need to move the racket head with a little back swing before the forward movement can be done. It is the first forward movement that the receiver expects the shuttlecock to be hit (at Service). As we all know that during a rally, it is good to do double/multiple swings (to deceive or to wrong foot our opponent). The Laws of Badminton allow us to do so during a rally. It is only at Service that the Laws do not permit us to do the double/multiple action. .