Dim Mak aka The Death Touch or Death Point Striking
,not ki, injection through fingertips/one knuckle punches/kicks into the enemy's chi flow channels. The same points to strike are used for acupuncture. Dim Mak is not a sport. DIM MAK IS ONLY USED FOR SELF DEFENSE.
Ex: the famous chop to the side of the neck as seen in steven segal movies. The point here is near the carotid sinus - you can K.O. someone with just a stroke of this. Also, the twisting palm strike in the end of kill bill 2 (just the last screwing strike)
Dim Mak kills instantly or through time. Can cause disease if not practiced correct (due to bad chi), but an increase in health quality when practicing the health methods.
Dim Mak is proven and if your interested look up "Erle Montaigue" in a search engine
Methods to increase chi flow include qigung/qigong/chi-kung, and tai-chi-chuan.