According to Rule 18b of the ITF Rulebook:
During the service motion, the server shall not... touch the baseline or the court with either foot.
What, exactly, constitutes "the service motion"? I had always taken that to mean "the motions leading up to, and including, when you actually hit the ball." However, what if you step into the court as the result of some kind of continuous movement that you started prior to hitting the ball? For example, the rules permit the server to have one or both feet of the ground; if you jump to hit the serve and then "land" inside the court after hitting the ball, is that a foot fault?
Does hitting the ball automatically "end" the service motion?