Motion: The Sine Wave
The sine-wave motion (파상 운동) is what most clearly sets modern ITF Taekwon-Do apart from other styles. Rather than holding the hips at a constant height, the body moves through a gentle down–up–down curve with each technique, adding the mass of the dropping body to the strike (the principle of Mass in the Theory of Power).
The basic sine wave has three parts, driven by a relaxed “knee spring”:
- Down — relax and lower slightly at the start.
- Up — rise as the movement begins.
- Down — drop the body weight into the technique at the moment of impact.
Note: the sine wave was formalised in the 1980s. Some ITF groups and older lineages move more flatly. This is a difference in style, not a mistake.
Types of Motion
How techniques are linked together within a pattern.
Brackets along the top show where each technique starts and ends. The charts show typical timing only. Reference: ITKD motion study.
Normal motion
One full sine wave for each technique. This is the usual rhythm.
Continuous motion Yonsok
Techniques flow into each other without a pause, as in Dan-Gun 13–14. Longer sequences may use smaller waves.
Fast motion Bballi
Techniques follow each other quickly, but each one is still completed. In Do-San 15–16 you rise straight from the first punch into the second.
Connecting motion Ieumdong
Two techniques share one breath and one wave: the first finishes at the top and the second on the way down, as in Yul-Gok 16–17.
Slow motion
A technique performed deliberately slowly to show balance and control (e.g. the slow movements in Toi-Gye and Juche).
Reaction force pairs
Many movements pair an attacking tool with the opposite fist or foot pulling back sharply, supplying power through reaction force.
Breathing & Timing · Hohup
In ITF, breathing is tied to the movement. The general rule is one breath per technique: inhale (or partly inhale) as the body rises in preparation, then exhale sharply at the moment of impact, tensing the abdomen to add power and to be ready to absorb a counter-blow. The out-breath is normally silent, but a sharp shout (kihap) may mark the focus point.
Length of a movement: a normal technique has a clear preparation and finish, but no fixed duration. The other types of motion change the timing and breathing:
| Motion | Timing / length | Breathing |
|---|---|---|
| Normal | One full count per technique | One exhalation per technique |
| Continuous · Yonsok | Smoothly linked techniques, with the prescribed rhythm | Inhale once; emphasize each technique on the outgoing breath |
| Fast · Bballi | Urgent succession, with each technique still distinct | A short sharp exhalation on each |
| Connecting · Ieumdong | Two techniques joined into a single count | One breath shared by both |
| Slow | One technique stretched over several seconds | One long, controlled exhalation |