The tip of todays post wich I have revealed several times before on this blog is simply to consider the hand that is drawn back to the hip. You see today most people think that the pulling hand is drawn back for traditions, some think it is an outdated fighting style that we practise anyway, but we modify it on the street. Others say it is done to create more power. In the older textbooks "the pulling hand" is indeed often explained as a way to create more power. In some textbooks the answer is pretty vague, and in others the authors go to great lengths to explain it within newtonian "science". E.g the pulling hand is the reaction force as all action creates an equal reaction etc.
Look at the drawing below to see the "official applicaiton" to movement 5/6 in Taegeuk Sam Jang (Inward knife hand strike to the neck).
If we go back one step further than the Kwan leaders and look at how the pulling hand was explained by the teachers of the Kwan originators we find a very simple yet effective explonation. Gichin Funakoshi who is often lamented as a Karate teacher without any deep knowledge in the application of his forms writes a very good explonation for the pulling hand in his Karate Do Kyohan. He writes (paraphrasing) that the pulling hand is used to grab the opponents limbs and pulling him into the attack while twisting the arm. This increases the efficiancy of the defenders attack, while decreases the opponents chances of counter attacking the defender.
I have just taken the normal application seen in the earlier drawing and applied Funakoshi`s explonation from Karate Do Kyohan to it and if you look below you will see the result:
The same principle can be used in all striking applications that do not use the pulling hand in application but it does in the form. It can even be applide to several "block" as strikes. Low block becomes hammer fist strike to groin, inward middle block becomes hammerfist strike to jaw and high block becomes forearm strike to side of the neck or jaw. All three with the same grabbing motion used in the second application in this post.
Considering and making use of the pulling hand is one fast and easy way to make a lot more sense in the forms than the things that are normally taught as applications.