One part of the body can only perform one function. This is an important rule in taijiquan. If followed, the separation of yin and yang will be made possible. Otherwise, all movements are actually one or the same regardless what the practitioner feels, thinks or believes.
Only when the body parts are individually assigned in performing a specific task, can multi-tasking be possible. The multi-tasking is what we call yin and yang.
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改变原有的舒适的一切动作，这些对于太极来讲，只要不是按照规矩做的动作，都是没用的，严格讲并不是太极得东西，今早试着严格按收肘出手等要求行拳，感觉身体成为铁板一块了，但是各关节都像自攻螺丝，劲力十足，也许行拳就应该带着钻劲全身螺旋，并没有所谓的放松。老师讲的东西按规矩练了，不同的时间收获是不同的。