The idea of describing body movement as a “transfer of mass into a target” is a widespread training metaphor, but physically inaccurate. Mass is not transferred. What actually changes are the direction, coupling, and temporal organization of forces within a biomechanical system.

Movement arises from the redistribution of impulses within a structurally coupled system. What matters is how effectively movement is conducted through the system.

Mechanically, the body functions as a coupled structure composed of bones (compressive load-bearing elements), muscles and fascia (tension and force-network system), and joints (coupling points for force transmission). Force is propagated through contact surfaces and temporal sequencing. Every movement is therefore a process of structural activation under load.

This produces a continuous transmission of impulse from the lower extremities through the trunk into the upper segments and vice versa.

The coaching cliché “move as one unit” actually describes a biomechanical condition: a body can only transmit force efficiently if its segments are temporally and structurally coupled.

This coupling arises through neuromuscular coordination (feedforward and feedback systems), myofascial tension networks, and synchronized activation of functional chains.

Force transmission begins at contact with the environment. The ground provides the reaction force (Ground Reaction Force), which makes movement possible in the first place. The key question is how this external force is conducted through the system.

The body is a transformation system for external and internal forces.

“One-unit movement” describes a state of maximal functional integration. Efficiency emerges from structural coherence across the entire chain.

Dialogue

From the discussion. Aslan (Monkasei) and Kaplan (Sifu/Sensei) are speaking. Sons of the grey wolf who once came from the steppe to the Bosphorus. I also see Ariane. She is sitting, wrapped in a bath towel with a towel turban, seductively scented, on a gap between the dumbbell racks. We know her favorite, with whom she enjoys the “feast of love” in the dojo showers. Since the two of them confine themselves to the most discreet hours, only Master Kaplan could reveal anything from the inside. Without a doubt, he is the most qualified witness. Ariane shares an erotic secret with him. More on that elsewhere.

Aslan: I want to release the internal handbrake and act without inhibition.

Kaplan: Your goal is functional freedom. You no longer want the system to secure itself against itself (protective tension), but to channel all energy into axial transmission. To release the “internal handbrake,” you must understand how the system interprets the difference between danger and safety. The “handbrake” is not a single mechanism—it is the result of evaluative loops in the nervous system. Protective tension does not arise primarily because a single signal (e.g., jaw compression) indicates stress, but because the system detects a combination of uncertainty, low predictability, and mechanical instability.

The jaw plays a role via the trigeminal nerve and its projections into the brainstem. It is a modulator, not a singular trigger.

Aslan: So I release the handbrake by signaling stability to the system without going into compression.

Kaplan: Exactly. And here your concept of normal force saturation becomes interesting. You describe a shift in the source of stability from local, often reflexive co-contraction to focal joint compression.

Aslan: So radial expansion is a safety signal?

Kaplan: It is an input correlated with stability. When the following conditions come together—uniform pressure distribution in the trunk, coordinated activity, and predictable, coupled movement—the nervous system reduces protective tension because uncertainty decreases. This is not binary safety/danger but a continuous reassessment.

Aslan: And the load?

Kaplan: Here your model becomes strong. Load is stabilizing when the system can distribute it. Functionally: more load → more required pressure buildup. More pressure → more global stability. More stability → less need for protective tension—provided that the upper pole (including the jaw) does not lock, breathing does not become segmented, and the load does not get stuck locally.