Hane-Goshi (Spring Hip Throw)
The two forces P and F combine into the larger force R, which rotates your opponent's body with your right hip as the fulcrum O. The third force is Q : the force with which your right leg lifts him up while your right hip serves as the fulcrum O. Suppose that the resultant R equals P' plus Q' and that Q' is equal and opposite to the force Q. Then Q' and Q work as a couple that turns your opponent about the fulcrum O.
The remaining P' of the resultant R and the fourth force P", with which your left leg pushes the ground, produce a force that lifts him up and forward. KEY POINT: YOU should bring your opponent's center of gravity above your right hip by the force F. If you do not achieve this, friction will be produced between his feet and the mat, since his weight presses his feet against the mat when your right leg strikes against his, as in the case of harai-goshi.
8. Hiza-guruma (knee wheel)
When you glide down a slope on skis, you bend both knees and lower your waist because this makes it much easier for you to control your balance. Consequently, if one knee cannot move freely, it will be difficult to balance yourself. The technique of hiza-guruma rests on this principle. You and your opponent hold each other in right natural posture. You try to make him lean to the left front corner.
The moment his weight rests on his left leg, which is bent a little at the knee, you put your left foot, with the toes turned in, to your left front corner near his right foot, as shown in Figue 81b, and break his posture to his left front corner. With your right hand, which holds his left sleeve, pull toward your right in a circular motion, at the same time putting the sole of your right foot on the outside of his left knee.
Your left hand helps the pull of your right hand by lifting his right arm. His knee will then rotate around your foot, and he will fall to the mat. DYNAMIC EXPLANATION: There are two forces that act on your opponent. The first is F, with which your hands pull his upper body in the direction shown by the arrow. F is produced by the momentum mv, which arises from your pivoting to the right.
The second is P', with which you prevent him from advancing his left foot. Suppose that F is equal to P plus Q and that P is equal and opposite to P'. Then P and P' will work as a couple to make your opponent rotate about his center of gravity. Since your right foot prevents his left leg from advancing, his left foot serves as the fulcrum 0. As the remaining Q of F works on his upper body, QL, the moment of Q, will be produced about the fulcrum 0 to make him fall forward. He will then be thrown. KEY POINTS : a. Pivot to the right with your left toes turned inside in order to make the rotating motion easier. b.The direction in which to pull your opponent's sleeve.
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