Double Chi Sao is the simultaneous coordination and regulation of the position and manoeuvres of both your arms, individually and in separate directions. The accomplishment of this feat is thee primary exercise for the preparation of free contact sparring.
A student without a solid single Chi Sao foundation will experience difficulty when practising Double Chi Sao. Double Chi Sao requires unnatural ability to perform simultaneously two unlike manoeuvres with sensitivity and spontaneity. Such an exercise can be compared to the childhood game of patting on the head with one hand at the same time rubbing your stomach with the other. Each performing an individual motion. This skill is to manoeuvre each arm synchronously, while performing two different patterned motions is most unique and difficult characteristic of Double Chi Sao ability.
To better understand the difficulty of such an unnatural function, let us consider the difficulty of learning any new physical activity. The motor coordination or the route from mental command to physical action is not yet established and awkwardness results. With practice, the electric impulses from the brain to muscle tissue, which facilitate movement, become more defined. The path of reflex and response is clear. Now, we simultaneously attempt another physical movement while performing the newly learned one. For example, let us bounce a ball on the ground with hand and at the same time try tossing and catching another ball in the air with the other hand. You will feel and appear uncoordinated at first, however, with practice such manipulation of our hands in two different objectives is possible, and the advantages are many when the ability is perfected. Coordination of singular movement becomes increasingly easy. Multiple movements are also quickly assimilated. An opponent who moves in combinations of singular movements or patterns will be at a distinct disadvantage when faced with your coordinated multiple movement. This is the purpose of double Chi Sao training.
In order to perform coordinated movements simultaneously, one must perfect his ability to function singularly. It follows that there is lack of coordination in singular movement, multiple and simultaneous movement will produce extreme awkwardness. Therefore, it is of utmost importance to begin with the preparatory training of single Chi Sao. One must accomplish the required individuality of each arm with sophistication.
The purpose of using hands arms as the primary method of acquiring this multiple ability is really quite simple. There is many parts of the human body that can be utilized as efficient effective weapons. The ability to function these parts fluently and simultaneously is directly related to a firm foundation and motor coordination. Since the hand is the most flexible and easily manipulated part of the body, it serves as the primary vehicle of Chi Sao.
Within double Chi Sao there are two major methods of practice, Luk Sao and the breakouts (kuo Sao). Luk Sao is the standard position of Double Chi Sao practice emphasising the regular basic movements of bong Sao, Tan Sao and Fook Sao. The kuo Sau exercise is the change of movements from Luk Sao position into practicing crossing the bridge, trapping the hands and multiple striking techniques.