Well I think you can hit to destract and to damage. If you hit to damage or daze your opponent, I'd recommend hitting the temples, gouging the eyes, hitting the nose, upperlip and throat. Mid section: solar plexus, spleen, or any area of the lower belly (muscles are usually underdeveloped and therefore weak). Legs, knees, shins and ankles. Arms : elbow, shoulder joint. I don't know much about actually applying atemi outside of the dojo, but to me it would be a good thing to read about the weak points of the human body. Krav Maga is great at attacking the weak spots of the human body, but their methods are very brutal.