Training video from The Backhand King

For those who wish to learn what many consider the most difficult of all the badminton shot(s) - the link below includes training video for the backhand smash by XiongGuoBao, the Backhand King.

Xiong Guobao or more popularly known as Backhand King, a former elite level badminton player from China who won numerous international singles titles in the late 1980s. He has won 13 of the most sought-after titles in the game. His titles included the United States (1984), Japan (1987), Hong Kong (1987), Malaysian (1988, 1989), Thailand (1988), French (1989), Swedish (1988), and Indonesian (1989) Opens.

More at a writeup at BadmintonCentral

The backhand smash is a shot rarely seen on the court nowadays.

Please refer to the following link to his training videos on YouTube.

Xiong GongBao Training Videos

Xiong GungBao other training videos

Lastly a full length video below