Usually this is the first level taught once the Bong Sau and Lap Sau technique is learnt. With this basic combination the student can progress to the Bong Lap Sau Chi Sau, which is a flowing drill that builds endurance and conditioning in the shoulders & forearms. In The Wing Chun School system, a number of more advanced techniques from the Siu Nim Tau ( Little Idea ) and Chum Kiu ( Searching Bridge ) sets are incorporated.