You can hold you breath until your face goes blue and your ears pop-out but, your tennis service will not get any better until you can do this before contact with the ball:
Yes, without the hatchet position before ball contact your serve will always be a lame proposition!
Now go in front of the mirror (please don’t break it!) and practice this part of your serve, it will do wonders for your improvement!
Keep improving your game!
Understanding the tennis serve pronation:
Pete contact lef to right motion:
Federer Contact left to right motion:
Roddick (an effective mess!)
Gulbis – Wawrinka – Pronation and Left-hand use.