It’s best to establish a pattern that works well and always repeat it, whether it’s bouncing the ball a number of times or pausing for a set amount time before beginning the motion.

squashing the tennis ball under your lead foot in the process. Once you are used to the rocking motion, moving your weight into the left heel and then into the ball of the lead foot, you will ...

The beginning of your service motion should be slow ... He's ready to take a quick split-step and move to the next shot.