The 540 kick is a move originating in martial arts, commonly used in tricking. The name refers to a spin of approximately 540 degrees, accompanied by either a roundhouse or crescent kick. The same leg is used for the takeoff, kick and landing while the other is mainly used for momentum. It is often accompanied by a spin either before or after the kick. A variant of this move is the jackknife, which is a 540 roundhouse kick followed by a hook kick from the opposite leg. Although the move originates in martial arts it has little practical combat application.
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Taekwondo 540 Kick Tutorial
540 kick tutorial