During your service motion when do you "pull the trigger" and begin your acceleration to contact? I've seen this described as a "pause" too. Watching various pros and high level rec players it appears folks do it at different points, some pre-trophy pose, some post-, and others at the trophy pose. Are there advantages and disadvantages to pausing/pulling the trigger at different points? I've tried different points but the only one that feels natural to me is after smoothly moving through the trophy pose and, with left arm extended, racquet arm dropped back, and eye lined up on the ball, do I unleash and explode up at the ball (to the degree my damaged knees can explode up!). I guess that might be noob friendly but even some pros seem to flow past the trophy pose before pausing and pulling the trigger (eg Stosur). Other pros seem to blast through the trophy pose, pulling the trigger early in their motion. I never completely stop moving but I feel like I hit my best serves by flowing through the trophy pose and sort of lining up the racquet head on the ball as it floats above my head and visualizing an arc from the racuet head, to the ball, to a path over the net and into the service box.