During some of the movements, such as a block for instance, the opponent will forcefully displace your arm in a direction away form your intended target. It Will take you a few microseconds at least to get your arm back in the proper alignment to attack. Ch Sau teaches you how to overcome such inertia so that your attack never wavers an inch from its decided path. It is a very difficult practice to master, but after years of training it is said to develop both elasticity and softness in your muscles as well asa tremendous control over reflexes.
Constant Chi Sau practice also teaches strategy. You begin to “feel” a pattern in your opponent’s movements, allowing you to sense the proper angle of attack. According to Wong, the highest achievement in Ving Tsun is to be able to allow your opponent to guide you into the exact method of attacking ad defeating him.
Some Western pugilists might claim, pretty much as Wong did when he first entered Yip Man’s gym, that Chi Sau would be useless against an expert Western boxer. Wong himself felt that most boxers, by using a leading stance, are allowing their reverse arms to be at disadvantage due to an increased distance from the opponent. The jab is fast and efficient, but it still must come within range to be effective. There is when the Ving Tsun-man moves in. Once inside a boxer’s inner circle, Chi Sau methods match two hands to one. As a result of this sight inadequacy many boxers have altered their stances to confront opponents in a more head-on fashion.