Basically, to serve a tennis ball, you need to toss the ball high enough and in front of you (i.e., toward the net), so that your racquet will make contact with the ball at some point, and so that most of your weight is "behind" the ball, in order to get the most out of the racquet's momentum when it strikes the ball. The server always stands in the half of the court diagonally from his/her opponent's half of the court; the halves are referred to as the "deuce" (right half) and "ad" (left half) sides. At the end of a given point, each player moves to the other half, and the process is repeated until the game is won.
Sports where you serve a ball include tennis, volleyball, badminton, table tennis, and pickleball. In tennis, the serve starts each point, while in volleyball, the serve initiates play and is crucial for scoring. Badminton and table tennis also require a serve to start each rally, and in pickleball, the serve is used to begin each point as well.
You can hit an underhand serve in tennis; however, the overhand serve is more effective because it is more powerful. That is why you don't see the underhand serve used much.
a serve
Badly.
A tennis ball!
It depends on how hard you want to hit the ball
a tennis ball
Let
Yes
A tennis ball.
a fault
Fault