25/07/2026
Sine Wave, the Kinetic Chain and Continuity of Movement
The ITF sine-wave principle was developed as a method of using relaxation, body mass, knee spring, gravity, acceleration and breath control to increase the power of a technique. Properly applied, it should form part of a natural whole-body action rather than becoming a separate rise-and-drop ritual attached to every movement. ITF teaching also describes patterns as a means of developing smooth, fluid and rhythmical movement, with some combinations performed so continuously that it becomes difficult to identify precisely where one technique ends and the next begins.
However, the traditional performance style that later developed within sections of ITF Taekwon-Do often presents each movement as an isolated event. The practitioner completes a technique, locks the body into position, stops dead, releases everything and then begins preparing the next movement all over again, losing the momentum. Visually, this creates a sequence of highly defined photographs rather than one connected piece of physical action. It may make individual movements easier to judge in competition, but it does not fully reflect how the human kinetic chain produces efficient martial movement. Nor does it teach someone how to use the movements in a natural flow for self defence.
The kinetic chain describes the coordinated transfer of force through the body. In a punch, block or strike, power should not originate solely from the arm. Pressure is created against the floor and transferred through the feet, ankles, knees and hips. The pelvis and trunk rotate or shift, the shoulder follows, and the force continues through the elbow, forearm and attacking tool like a whip. A kick follows the same principle, with the supporting foot, leg, hip, trunk and kicking limb contributing in a carefully timed sequence. The body is not a collection of independent parts. It is a linked system, and the quality of the technique depends on how efficiently each link receives, contributes and passes along its part in the blow.
For this reason, the completion of one movement should create the beginning of the next. The final position of a block establishes the practitioner’s balance, hip position, shoulder alignment, muscular loading and relationship to the floor. Those conditions should become the starting point for the following counterattack, step, turn or defence. The first movement does not simply finish and disappear. Its remaining momentum, tension, rotation and positional advantage should be redirected into the next action.
This reflects General Choi’s broader conception of patterns as a continuous cycle of defensive and attacking actions rather than a collection of unrelated poses. Each movement has an individual purpose, but it also belongs to a larger sequence. The end of one technique should therefore contain the seed of the next. A chamber should grow naturally from the recovery of the previous action. A hip rotation should continue, reverse or redirect according to the tactical requirement. Weight transferred into one stance should prepare the body to move efficiently into the next.
This does not mean that every pattern must be rushed or that there can never be stillness. A pause may represent assessment, control, a tactical break or a deliberate change of rhythm. However, physical stillness should not become a neurological and mechanical disconnection. Even during a pause, the body should remain organised, balanced and ready, with the kinetic chain intact.
The difficulty is therefore not necessarily sine wave itself, but the way sine wave has sometimes been exaggerated and separated from practical movement. When every technique is followed by a complete stop, a visible reset and a new artificial rise, the practitioner repeatedly breaks the chain that should connect the floor, hips, trunk and limbs. Power is recreated for every isolated motion rather than carried, redirected and developed through the sequence.
A more functional interpretation would preserve relaxation, knee spring, body mass, acceleration and breath control while allowing the movements to connect organically. The practitioner should finish each technique strongly without becoming frozen. The body should arrive at the end of the movement already prepared for what follows. In that approach, a pattern stops resembling a row of statues and begins to resemble what it was intended to represent: a continuous engagement in which every defence creates an opportunity, every attack produces a reaction, and every ending becomes the beginning of the next movement.
Master Paul O'Leary
Rebel Martial Arts Association
Rebel Martial Arts Cork International Tae Kwon DO Council Taekwondo Council UK - TCUK Irish TaeKwon-Do Council What's The Point? - Pattern Application Article Series
