The correct use of the tossing arm is a key element on the serve. Two common mistakes are: first, bring the
arm up and take it down before one swings.
Second, bring the arm up and bring it to the
side of the body after you swing. This causes the body to
over rotate The correct way to use the arm is: Toss the ball bring the arm as high as
possible and keep it there, as long as possible, until the racket goes up. At that point
the arm is gonna come down to the stomach stabilizing the body. Keep the arm up and bring it to the stomach to stabilize.