I use a continetal grip and good pronation. Also i have good placement. But for my first serve which is flat, it seems the only way to get my serves in the service box is to snap my wrist at contact point and then point racket tip towards the ground. I have heard some coaches say to snap your wrist at contact. But others say to bring the whole arm and shoulder down and the snap of the wrist must come naturally and it is a myth to conciously snap your wrist. Obviously i have good shoulder turn and use my feet to push up aswell but it seems i always have to snap my wrist at contact. Is this wrong?