原地掷铁饼和旋转掷铁饼都是以预 摆开始动作的。在原地投和旋转投的预摆中，共同之处是要求运动员通过躯干和持饼臂的向后转动，将器械大幅度地向后转摆，使肩、髋之间最大限度地反向扭紧，让参与躯干扭转用力的肌肉充分拉长。但是由于原地和旋转技术各自后续动作的任务、目的 In-place discus throwing and discus throwing are based on the pre-swing began to move. Put in place and rotary cast in advance, the common feature is to require athletes through the trunk and holding the bread arm backward rotation, the instrument significantly backward swing, the shoulder, the maximum reverse between the hip Tight, so that the muscles involved in the torsion torsion fully stretched. However, due to the in-situ and rotating technology, the task of each follow-up action, purpose