Make a fast, quick move moving you wrist down hard. The most important thing is to do the action with you wrist correctly. From a position with the Wiimote pointing forwards and up, press A to lob the ball, and then, when you need to hit, move your wrist so it will point front and down, fast and strong. It should work.
How to do a very hard, fast serve in Wii tennis, you basically have to hit the ball at the right time- when it is at its peak in midair. It takes a little bit of practice. Look at the service line and when you see the ball reach it, that is when you swing.
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Go to the question "How do you do a hard serve on WII Tennis?", or something like that, I answered it there.
You may want to re-word your question by addressing the game that you are talking about in your question. The Wii is a console, not a game, and it doesn't have Tennis, but there are many games for the Wii that have Tennis, but, for example, you can't play tennis with just two people on Wii Sports. So distinguish what game you are talking about.
You burn about 5.3 calories per minute playing Wii Tennis.
The "silver tennis racquet" is a myth and its made up.
No, Wii sports does not support any kind of wi fi connection, and is played only by you.