Hoi Joon Moo Sool

"Do" roughly means martial art. "Ki" means energy, namely the energy of a living thing. (The Chinese call it "Chi.") "Hap" means union. So all three together, Hapkido means the union between living energy and the art of fighting.

Hoi Joon Moo Sool is a style of Hapkido. It's main move is called Hoi Joon Kong Po.

The right shoulder, (the first shoulder) is forward, and the left foot is back. First hand is forward and up. The first motion is made with a downward swinging arc, using the knife edge of the hand against a kick or a knee, or as a forward swing, striking the side of opponent’s right side of the head. The second hand coming straight from the belt, swings out straight-armed using the top of the wrist to strike opponent’s right side mandible or temple. Both arms are now swinging in the same direction.

Because both arms move in the same direction, enough inertia is created for the body to spin full-circle. The forward hand completes its arcing strike and ends pointing straight to the sky, and the back foot takes one step forward and the body spins full-circle on the forward arm and rear foot’s axis. The rear hand, after striking, bends at the elbow to protect the face and head.

To complete the full spin, the forward hand comes down from its position as the body’s axis to the level of the opponents head, and becomes a hammer to strike the opponent's right side of the head, while the rear hand remains in position blocking the face and head.

This move should be practiced with both clockwise and counterclockwise spins, right hand leading the clockwise spin, left hand leading the other. It should also be done as quickly as possible, aiming to complete the full spin in less than half a second. It should also be done at close quarters, advancing only about 1 meter’s length.

As such, the opponent can be pushed back 1 or 2 meters while three very hard strikes are effectively delivered in less than a second to vital points on the right side of opponent’s head.

This is the whirlpool. This is the hurricane, the tornado. This is Hoi Joon Moo Sool, the martial art of the maelstrom.