Re: Tennis question
There are two ways to put on the ball. One is the angle you hold the racket at, the other is how you move it. If you're watching Venus, she puts 'topspin' ie forward rotation, on the ball by starting the racket low, and brushing upward on the back of the ball as she hits it.
'Slice', or underspin, can be achieved either by brushing down on the back of the ball as you hit, or by holding the racket at an angle so that when the ball bounces off it, it has a backward rotation. The latter is easier than the former.
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