. Applied anatomy and kinesiology. the trunk is used as far aspossible to aid the arms. Grasping the weight as it lies on the floor,it is brought to position (Fig. 157), by the action of the extensorsof the trunk and limbs, the flexors of the hand and the trapeziusalso acting. To come to the next position, seen in Fig. 158, thetrunk is raised with enough speed to give the weight a quick upwardmovement, making it easier for the biceps group to flex the elbow;then to finish the lift the trunk is quickly flexed to left, the sidepushing against the elbow and giving the weight another upwardmovemen
. Applied anatomy and kinesiology. the trunk is used as far aspossible to aid the arms. Grasping the weight as it lies on the floor,it is brought to position (Fig. 157), by the action of the extensorsof the trunk and limbs, the flexors of the hand and the trapeziusalso acting. To come to the next position, seen in Fig. 158, thetrunk is raised with enough speed to give the weight a quick upwardmovement, making it easier for the biceps group to flex the elbow;then to finish the lift the trunk is quickly flexed to left, the sidepushing against the elbow and giving the weight another upwardmovement. This makes it possible for the triceps and the arm-raising group to bring the arm to position (Fig. 159). Lifting is made easier, as we have seen, by shortening the weightarm of the lever, and more can be lifted with the elbows flexed, asin Fig. 154 than when they are fully extended, as in Figs. 155 and156. But the extensors of the trunk and limbs are larger andstronger muscles than those of the arms and it is therefore easier. Fig. 157
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