Thanks for your video contributions. I'll take a look. I also appreciate your videography instructions. Please read the explanations that I provided Jake Speeed in post #36 with no ROI. I can tell you would be more forthcoming. I was mostly interested in gaining some specific understanding of weight shift and toss coordination differences between platform and pinpoint serves. I'm not a technique maven though. From my experience with teammates, I believe it's often overemphasized. I appreciate your willingness to get into the weeds, but that's beyond me.A lot of threads involve discussions of undefined terms. What is your meaning of "weight shift" on the serve?
Can you show it in a high speed video? To single frame on Vimeo, hold down the SHIFT KEY and use the ARROW KEYS. Sometimes it skips a frame. You can use the time scale and count frames after each second, In the first video, impact has occurred at 20 seconds plus 3 frames. Or describe the time relative to Trophy Position or impact. Weight shift is around ?? seconds or 'ends at impact'.
If you Google weight shift tennis serve can you find information that describes your meaning?
Note the motion of the racket head at impact, and its direction.