Ouchigari(Major Inner Reaping)

Then P' and P work as a couple to make your opponent rotate about his center of gravity. Since the remaining Q' of F acts on his upper body to make him fall backward, his right heel serves as the fulcrum O. Therefore the moment Q'L about the fulcrum 0 works to make him fall backward, and he will be thrown on his

KEY POINTS: a. You must reap your opponent's left leg smoothly, just when he rests almost half his weight on it, so as not to create f rictional resist ance between his foot and the mat. b. If he shifts his weight from the left foot to the right, your reap ing action will be ineffective. Therefore you must push him with your right hand toward his left back corner to prevent him from putting his weight on his right leg.

Kouchigari(minor inner reaping)

If you stand with both your feet wide apart, you will have difficulty shifting your weight from one leg to the other quickly, as we observed in discussing ouchigari above. If you stand with both your knees bent a little, your waist lowered, and your feet wide apart, the same condition will exist. If your opponent stands in such a bad posture, it becomes easier for you to throw him down, since his center of gravity is lower than yours, and his position prevents him from changing his stance quickly. Ko-uchi-gari is the technique that takes advantage of this condition.

You and your opponent hold each other in right natural posture. When he spreads his legs more widely than usual and lowers his waist a little, you unbalance him to his right back corner by pushing with your right hand while pulling with your left hand, as shown in Figure 87&. At the same time you push him backwards with your right hand by taking advantage of the force with which you strike the right part of your chest against his. You pull his right sleeve downward with your left hand while reaping his right heel from the inside with your right foot. He will then be thrown on the mat.

DYNAMIC EXPLANATION : There are four forces that act on your opponent. The first is the force P, with which you reap his foot. If you reap his right foot, he is forced insufficiently to support his body weight on one leg only. The second is the force Q, with which you pull his right sleeve downwards with your left hand. The third is the gravity G, which acts on him vertically. The force Q, with which you pull downwards, and the gravity G result in a larger force that also pulls him downwards. The fourth force is F, which is produced by the momentum mv created when you advance your body against his. Force F acts on him to push him down and back. When he is thrown back¬wards, the heel of his left foot works as a fulcrum.