您应该肘部弯转90度，双臂前后摆动(旋转，以肩部为中心)，而不是左右摆动。

Your arms should be at a 90 degree Angle and should be moving forward and back (rotating at the shoulder), not side to side.

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方法：100位健康志愿者在体测量颈椎屈伸、左右侧弯和旋转。

METHODS. : Active cervical flexion, extension, right and left lateral flexion and rotation were measured in 100 healthy volunteers.

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步行带动腰椎向前弯曲并随左右下肢运动而旋转、侧弯，其主要作用力来自腰大肌。

Walking brought along the lumbar vertebra to bend forward and rotate with the movement of right and left lower limbs. The main force to finish this movement came mainly from musculus psoas major.

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