Well Master Betty, My google skills are a fail. I couldn't remember the name of the technique so I fail. Here is the technique, well close to it: [ame="http://www.youtube.com/watch?v=pcDAzdctMoY"]YouTube - Krav Maga 6: Side Hammer Fist: Human Weapon Self Defense Technique[/ame] The above is simply not great, but would be probably how to start teaching it to a beginner who didn't have a lot of time spent building the structure. It starts out as a back knuckle strike. Depending on the target hit and whether the target is moving away or into you, the back knuckle rotates into a hammer fist. For example, if the target is the heart, the strike rotates into a hammer fist. If the target is under the arm pit, then it stays a back knuckle as you jerk their arm and rotates only partially into a hammer fist. If the target is the side of the head, the back knuckle strikes but is quickly rotated on impact to a hammerfist to strike the side of the neck/jaw line with the forearm. The Tai Chi version strikes with the back of the open hand instead of the closed fist. The rotation is then to a palm strike instead of a hammer fist. So now I bow down to you Master Betty because I can't see how any of this demonstrates the power of the technique as I thought would be an easy thing to do. :hail: Edit: what I have found is that the rotation to the palm strike after striking with the back knuckle gives the most power. The effect is similar to striking with the knuckle and then following up with doing CPR on them (the motion of the palm and body when you do CPR on someone to start their heart pumping, you get a lot of your body mass behind it in a short burst.