Applied anatomy and kinesiology, the mechanism of muscular movement . The forward roll. Midway. undertake the long or high dive, in which the body is launched intothe air head first by a forcible extension of the limbs, touches themat first with the hands, and completes the movement as in the GYMNASTIC MOVEMENTS 295 forward roll. The muscular action is the same but much morevigorous, the arms having to sustain more weight to protect thehead from striking too hard and the speed of the movement makingit more difficult to flex the body soon enough. The front summersault is a variation of the high
Applied anatomy and kinesiology, the mechanism of muscular movement . The forward roll. Midway. undertake the long or high dive, in which the body is launched intothe air head first by a forcible extension of the limbs, touches themat first with the hands, and completes the movement as in the GYMNASTIC MOVEMENTS 295 forward roll. The muscular action is the same but much morevigorous, the arms having to sustain more weight to protect thehead from striking too hard and the speed of the movement makingit more difficult to flex the body soon enough. The front summersault is a variation of the high dive. The gym-nast springs high into the air and then suddenly flexes his wholebody into the position it takes in the forward roll. To do this inthe air and to do it quickly enough calls for a very sudden andstrong action of the flexor muscles of trunk and limbs, beginningwith a violent downward swing of the arms. The body turnscompletely over in the air and at exactly the right time the exten-sors act and support it in normal position on the Fig. 178.—The forward roll. The finish. The backward roll reverses the movement of the forward body is quickly flexed to the circular position described above(Fig. 178) and tipped strongly backward to give momentum, withthe hands held back over the shoulders at each side of the back strikes the mat first and the body rolls (Fig. 177) backwardon to the shoulders, neck and head, the arms pushing backwardand keeping the weight from bearing too heavily on the head. Thisstage calls for strong action of the flexors of the entire spine andlimbs, to maintain the flexed position, and strong arm elevationwith flexed elbows to support most of the weight. The arms bearpractically all the weight for a moment and then as the roll con-tinues the feet come to the mat and the body rises to erect posi- 296. GYMNASTIC MOVEMENTS tion. It is difficult for beginners to strongly elevate the arms andstrongly flex the trunk and limbs at
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Keywords: ., bookcentury1900, booksu, booksubjectphysicaleducationandtraining
