Originally Posted by 5263
When the elbow extends earlier in the movement, it will move slower to make the contact timing work out. By delaying, the racket must go farther in a shorter amount of time; which will equal racket head speed when done right.
I'm not sure I can see the picture. Do you have a link with pictures to explain this? I think my best serve is only about 75-80 mph. And I see players with really bad 2nd serves can hit 1st serves pretty fast. Not sure how they are doing it.