Serving - Ball path

At the very beginning of the 'serving techniques' video, you mentioned that the serve is illegal when you toss the ball in such a way that it does not follow a straight line path.

 But in all the pendulum serves and in most other techniques of serves, I saw that the ball is seen in an inverted V loop. Am I missing something?

- Kalyan 

Hi Kalyan,

You are right.  This is something that wasn't policed that much when we both played so we have a bad habit.

The umpires can allow a little wayward toss as long as it is almost vertical.