Transcription

• Speaker #0

  Hi and welcome to the BioPilates Deep Dive. Today we are going to explore a fundamental exercise on the reformer, the side-sitting twist, the side-twist sitting. This exercise, although seemingly simple, is in reality a true indicator of movement quality. It raises an essential question, how do we rotate without losing organization? In this approach, Rotation is never global or approximate. It is segmental, progressive, and controlled. The spine does not rotate as a single block. Each vertebra contributes subtly, and it is the sum of these micro-movements that allows for a fluid and safe rotation. From a biomechanical perspective, most rotation occurs in the thoracic spine. The lumbar region, on the other hand, is very limited in this function. Due to the orientation of its facet joints, it is designed to stabilize rather than to rotate. This means that any attempt to initiate rotation from the lower back quickly leads to compensations. The twist must therefore emerge higher up, but it can only do so effectively if the base is stable. The pelvis then becomes a central element of the exercise. In the side twist sitting, it acts as a foundation. it must remain organized stable without tilting or lateral shifting. This stability is not rigidity, but the ability to contain movement. It allows the spine to mobilize above without losing alignment. We enter here into a logic of dissociation. The pelvis stabilizes while the spine mobilizes. This dissociation relies on the activation of the center, the transversus abdominis and the pelvic floor, create internal pressure that supports the lumbopelvic region. This pressure acts as a three-dimensional stabilization system, limiting unwanted movements and protecting the lumbar structures. Breathing plays a decisive role in this organization. During exhalation, the activation of the deep abdominals reinforces stability. During inhalation, the ribcage expands and maintains space within the movement. Fluid breathing prevents compression and promotes a more azed and better distributed rotation. The rotation itself is built according to an ascending spiral logic. It does not occur abruptly, but is organized progressively from the lower to the upper spine. Each segment contributes a small part of the movement, allowing mechanical stresses to be distributed and avoiding localized overload, particularly at the intervertebral discs. This spiral organization is both a mobility strategy and a protective strategy. This movement is orchestrated by the obliques. The external oblique, located superficially, originates from ribs 5 to 12 and inserts into the linea alba, the iliac crest, and the pubis. It is innervated by the intercostal nerves, T5 to T12, and produces contralateral trunk rotation. the internal oblique, Deeper originates from the iliac crest, the inguinal ligament, and the thoracolumbar fascia, and inserts into the lower ribs and the linea alba. It is innervated by nerves T7 to L1 and produces ipsilateral rotation while contributing to stabilization. In rotation, these two muscles never work in isolation. They function in cross-synergy. during a rotation to the right, for example, the left external oblique and the right internal oblique activate together. This coordination allows the movement to be produced while being controlled. One generates the movement, the other modulates it, slows it down, and organizes it. It is this interaction that gives rotation its fluid and progressive quality. However, this mechanics can only be effective if the upper body remains organized. The shoulder blades must remain stable on the ribcage. They must provide support without excessive rigidity. If they move excessively or become tense, they disrupt force transmission and alter movement quality. The arms, meanwhile, must remain secondary. They create a lever and increase resistance, but they should never initiate the rotation. When the arms take over, the movement becomes peripheral and and the work of the center disappears. The side twist, sitting therefore develops an essential skill, the ability to dissociate stability from mobility. It teaches the body to maintain a stable axis while allowing precise movement. It improves coordination, body awareness, and motor control quality. Functionally, this is fundamental, as rotation is part of many everyday movements. When poorly distributed, it creates excessive stress, particularly in the lumbar region. This exercise helps retrain these patterns. It promotes a more balanced, efficient, and structurally respectful rotation. It becomes a tool for preventing pain and imbalances, but also for optimizing movement. A body capable of stabilizing and mobilizing with precision is a more efficient body. Finally, it is essential to adapt the exercise to each individual's capacity. If the seated position limits mobility or creates tension, adjustments are necessary. Elevating the pelvis, modifying the leg position or reducing the range of motion helps preserve the essence of the exercise. The goal is never maximum range, but coherence and quality. Thank you for sharing this moment. See you soon for the next episode of the Biopalates Deep Dive.