fast and deadly in true Taekwon-do. For example, virtually all movements in the original ITF Taekwon-do techniques have added acceleration. After twisting your body or hips (1st acceleration) your hand or foot techniques speeds up more (2nd acceleration on top of your 1st acceleration) to give more power not found in most other martial arts. Sine wave principle is another version of that. A bit of sine wave was always there even in the old TKD techniques, except this time in my opinion; they went a bit too far and it got over exaggerated ." Another well respected TKD instructor from Argentina had this to say on reading the article "I cannot agree more on everything you have written. Excellent. Extraordinary. I have additional reasons against the exaggerated modern sine wave: It is not compatible with the application of certain techniques which are supposed to be delivered upward (i.e., Hwa Rang and Gae Bek's underpunches) or almost horizontally (like Yoo Sins's direct reverse punches where the opposite hand is over the punching upper-arm trapping the opponent's attack while going for the armpit/ribcage). Furthermore, the exaggeration has lead to make up an unrealistic rhythm that prevents  combinations. One thing is to know we are not karate, but let's keep the good things of our ancestors!!! In summary, I don't recall anyone, especially General Choi saying "hold on, I got it wrong" & changing the Diagram/method from A to B! So what is right & what is wrong? Neither really if you