i'm going with 'not efficient' though.
you're losing a lot of energy with the jump and you're also hitting while your body is falling.
you have a live arm and you are using your legs but timing is off. (not hitting on the way up) (check out essentialtennis.com's free serve course in 3 parts for good info on that)
i'm going to guess you hit a lot of serves long, right?
you need to incorporate some hip coiling. you have none currently. minus a minimum of 5mph right there.
could use some more cartwheel too.
I'd bet with that live arm and a little better timing, coil and some more cartwheel you could hit at least 10mph faster which is a lot.
Also, that first serve is not a slice.
Yonex VCore 100s - SW 351 6pts HL Tour Bite / Luxilon 4G 16 @ 51lbs
Last edited by Cheetah; 05-08-2013 at 10:49 PM.