The sequences above and to the left show two people serving at tennis. In the sequence above the player is using only the arm and shoulder to swing the racquet, with possibly a little help from the right leg to increase the force of the stroke.
In the second sequence the whole body is used to gain a more forceful swing. The upper torso is curved back, so that the legs, waist, abdomen and shoulder all contribute simultaneously to the action of striking the ball. At the moment of impact, almost every muscle in the body is concentrated in the action. This is a graphic demonstration of the way in which athletes use their bodies to greatest effect.
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