Chi Sau additionally refers to methods of rolling hands drills (). Luk Sau participants push and "roll" their forearms against each other in a single circle while trying to remain in a relaxed form. The aim is to feel the force, test resistance, and find defensive gaps. Other branches have a version of this practice where each arm rolls in small, separate circles. Luk Sau is most notably taught within the Pan Nam branch of Wing Chun where both the larger rolling drills as well as the smaller, separate-hand circle drills are taught.