I will try to give a brief description. In many karate systems if you are doing sitting / horse stance punches your knees do not flex and your head remains level. Similarly when Karateka step their head tends to remain level. Prior to his 1980 Text General Choi used the term "Knee Spring" to describe flexing the knees when you performed hand techniques.I have no clue what "Sine Motion" is.
Can someone break down the differences and what was changed for me?
As do we in Nihon Goshin Aikido. I need to get together with my brother and have him teach me this "sine wave" approach (he holds rank in TKD), to see what I can glean from it.I see. In Northern Shaolin Kung Fu we emphasize keeping the head level when punching and stepping. Thanks for the information.