是形意拳全体用法套路之一，熟练后可以生生不已，变化无穷，达到无形无象，随心所欲的境界。双方虚领顶劲，松沉对垒。

It is one of the usage of the whole routine of Xingyi Quan. After you are getting good at it, it has many changes, invisible, casual realm. Both partner lead emptily and prop up, relax and face to each other.