How does he smash?????? I see some people smash using only their wrist and a bit of arm,some swinging the racket to the side and some,straight if you know what i mean.
There's some slow motion vids on Youtube, like this one (from side) and this one (from above) and finally this one (shows arm well). You can search around for more slow motion videos too, e.g. there's a good one on LCW's (Lee Chong Wei) footwork in slow mo here.
