Dan-gun: Power Generation in Karate Styles
Today while teaching our white (almost yellow) belt the soodo or shuto knife hand strike, I offered him my arm to strike while I took turns striking his forearm. Obviously as the beginner and someone who is taller than me by at least 5-6 inches there were many times when he tried to use muscular force and strike my hand with his knife hand technique. It resulted in a slow strike with my arm being pushed away. My strike however struck fast, extremely hard, and was a bone jarring technique that need only be felt once or twice before you're obligated to change sides.
The difference is that once the technique is learned, you need to give yourself the permission to relax more up front and accelerate much more throughout. The distance is not that great, so the differential in speed is key to making this a lethal technique. Obviously the kime or focus during the strike and the drop of centre of gravity is also required to add a lot of power to the strike. Once this was discussed, the power he created started to improve very very quickly to the point where I was unenthusiastic about using my arm as the target. :-)
Comparing the different hard styles is by no means offering disrespect - it is just that we need to recognise what each system is about and maximising our actions within those techniques. If we were working on a lot of Sanchin or building up our power and endurance ... then we'd be focusing on way different techniques and results.
Dan-gun: Knife Hand on Premium Unleaded even in Back Balance
Dan-gun Soodo: Don't get Slowed by the Fold
Traditional Taekwondo Technique Workshop