Applied anatomy and kinesiology, the mechanism of muscular movement . of the circle, theextensors of spine and limbs continuing in action to recover erectposition. As the feet strike the ground in alighting the balance isapt to be so far forward that the extensors of trunk and right limbmust relax to a certain degree, using a lengthening contraction ofthe muscles until the center of gravity of the body is broughtwithin the base. Notice that while the muscles used in throwing PLAYS, GAMES AND SPORTS 305 and putting the shot are almost the same the coordination is alto-gether different, the one
Applied anatomy and kinesiology, the mechanism of muscular movement . of the circle, theextensors of spine and limbs continuing in action to recover erectposition. As the feet strike the ground in alighting the balance isapt to be so far forward that the extensors of trunk and right limbmust relax to a certain degree, using a lengthening contraction ofthe muscles until the center of gravity of the body is broughtwithin the base. Notice that while the muscles used in throwing PLAYS, GAMES AND SPORTS 305 and putting the shot are almost the same the coordination is alto-gether different, the one putting emphasis on rotation and theother on extension; the first aiming to give a light object maximumspeed, the other aiming to exert most force in the right directionagainst a heavy weight; the first emphasizing accuracy and theother neglecting accuracy for power and speed. Throwing the hammer, like the use of the sling by the ancients,utilizes centrifugal force to a greater extent than other forms ofthrowing. The thrower stands in a seven-foot circle and begins. Figs. 184 and 185. Fig. 185-Action of the whole body in putting the shot. the movement by swinging the hammer in a circular directionabout his head, the circle being lower in front of him and higherbehind him. This uses the pectorals, serratus and anterior deltoidof one side and the trapezius and middle and posterior deltoid ofthe other, reinforced by the strongest action of the rotators of thetrunk and hips. The body stoops forward somewhat as the ham-mer swings forward, enabling the extensors of hips and spine tohelp as it swings backward over the shoulder. The arms, whichflex in beginning the first swing or two, remain fully extended afterthe hammer has attained speed; the feet are separated and by alter-20 306 PLAYS, GAMES AND SPORTS nate flexion and extension the iimbs help in the circular movementof the body and arms. After attaining the most speed that can begained in this way the athlete turns his entire bod
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