"Double Worshipping of the Buddha" is an excellent pattern in Siu Lin Tou to explode force

Course participants convert energy flow into internal force, and perform Siu Lin Tou at the internal force level. It is easy for the uninitiated to confuse this aspect of force training, which is "wan keng" ("yun jin" in Mandarin) meaning "channeling internal force", with isometric exercise. A useful way to tell the difference is to test whether you can speak comfortably when channeling internal force. If you can't, you are probably performing isometric exercise.