Dim Mak Death Touch

Advocates of Dim Mak say that its practitioners are capable of inflicting serious harm to an individual by disturbing their qi or energy flow throughout their meridian channels, causing stagnation of qi, which in turn can lead to injury or fatality.

The method depends on the ability to strike precise locations along an appropriate meridian at an appropriate time of day during which specific points are “open” and are thus vulnerable to attack. In these circumstances, certain vital points move throughout the day, and must be struck in relation to their position in the body at that particular time of the day, taking into account the circadian rhythm and associated changes in blood flow on or near the skin surface to have the desired effect. Thus, it is an easy matter for a novice to learn the stationary vital points, but to understand and use the “fatal” moving points in combat is akin to a relatively inexperienced person who can see the electronic elements in a diagram, but without the deep understanding of what they do individually or with each other.

Source: Wikipedia