A great exercise in Fa Jin (發勁) – Power Generation. It is very helpful for getting the whole body into the right zone for creating consistent, dynamic power. Using a length of material on a cane and succeeding in making a cracking sound shows us that we are generating power. We first do this with our feet still then we can get more dynamic with our footwork. To improve on this further we can use two banners and use a longer stick or pole.
For more on Fa-Jin, you can see Sifu Lomas’ article here: http://www.manchesterkungfu.com/fa-jin/