JDK's Taekwondo Blog is a contemporary online journal of Traditional Taekwondo.
Training methodology is the secret allowing modern practitioners to access traditional systems.
JDK practices in John Leckie Pavilion, College Park, Nedlands, Perth, Western Australia.
From my observation, there are few if any hard style karate or taekwondo schools that teach a close quarter centreline vertical fist punch ala Wing Chun, Isshinryu or Savate's piston punches. Yet basics for close quarter techniques are right there in Do-san, the third form we have ... which features forward facing backfists and spearhand done with a horizontal open hand trapping technique. This kind of close quarter punch is related to the discussion of punching life-cycle -- any point along the punching line is a legitimate strike irrespective of the rotation of the fist. In fact it is acceptable to even strike with the forearm whilst punching or create havoc by recoiling the punch and making contact with the thumb-knuckle to the neck or other sensitive regions. Inclusion of such training allows the student to deal with opponents in the short range, and more importantly skills them up to deal with opponents that jab iteratively or who attack at melee range without the 'standard' step forward with entire body.