Ive read quite a bit that palm heel strike may be a very effective tool in self defense, even more so than closed fist technique due to the lesser risk of damage to your own hand. Several questions, if this is such a great technique how come this technique doesnt show up in the heian/Pinnan series? is it hidden for school children, is it merely my style has changed it, or did Itosu not prefer this technique? and how effective is this technique compared to a fist? As you all have gathered we rarely practise this in my style of karate and dont know much about it.