Applied anatomy and kinesiology, the mechanism of muscular movement . Fig. 182. Fw. 183Figs. 182 and 183.—Action of the whole body in throwing. 302 PLAYS, GAMES AND SPORTS the spine and by rotating the right hip inward and the left hipoutward. Then, as the arm goes forward the body is inclined quicklyin the same direction by a vigorous contraction of the extensors ofthe right hip, knee and ankle and the flexors of the spine, and atthe same time it is swung quickly to left on its vertical axis by theoblique muscles of the trunk, reinforced by strong action of theoutward rotators of the right hi
Applied anatomy and kinesiology, the mechanism of muscular movement . Fig. 182. Fw. 183Figs. 182 and 183.—Action of the whole body in throwing. 302 PLAYS, GAMES AND SPORTS the spine and by rotating the right hip inward and the left hipoutward. Then, as the arm goes forward the body is inclined quicklyin the same direction by a vigorous contraction of the extensors ofthe right hip, knee and ankle and the flexors of the spine, and atthe same time it is swung quickly to left on its vertical axis by theoblique muscles of the trunk, reinforced by strong action of theoutward rotators of the right hip and inward rotators of the left,and by a violent backward swing of the left arm. This action of thebody almost doubles the distance the ball travels in the time it isbeing moved forward by the arm and consequently nearly doublesthe speed with which it leaves the hand. A ball is made to curve as it passes through the air by giving itwhirling motion on an axis at right angles to its line of flight, ornearly so. The rapid rotary movement of the ball causes greaterair fricti
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