It is important to throw your opponent by making use of his loss of balance. One of the laws at work here is the law of gravity. All bodies in the universe attract one another. Now let us consider the application of the law of gravity to judo. The heavier the opponent, the more difficult it is for you to move him horizontally. It is even more difficult for you to move him vertically. On the other hand, a larger gravity acts on him to make him fall. In judo, gravity may be represented as a force pulling the opponent downward. If you want to make him fall, you make him lose his balance; that is, you cause his center of gravity