Originally Posted by sureshs
If you pull the racket in, and it in turn is in physical contact with the ball at impact, do you think it will pull the ball further in towards you or send it out at 80 mph? You can try it by leaving a ball on the court, touching it anyway you want with the racket at any angle you like, and pulling the racket. See if the ball comes in towards you or goes out speeding in the other direction.
Thank you for the example, which I think shows that you are talking about backwards, which I think no one else here is implying when they use the word in. Perhaps we are better of with the term across.