Have you ever observed the running posture of top marathon runners?
As they raced at extremely high speeds on the track, their shoulders remained calmly facing forward, without any unnecessary lateral movement. Yet their lower bodies moved with exceptional fluidity, their strides large and light, radiating a painless, elegant, yet powerful sense of movement.
Many runners, in an attempt to mimic this stability, desperately "tighten their core," trying to lock their bodies into a rigid, unyielding state. However, the curse of sports injuries faced by runners with a staggering 651 TP3T annually is often due to this rigid, "hard-on-hard" running posture.
From a biomechanical and psychological perspective, the pelvis during running is not a rigid bone, but a precise two-way gyroscope.
Walking and running are two completely different physical models.
This is something that many people don't know.
When walking, the balance between the upper and lower body is mainly maintained by the twisting of the lumbar spine. This mechanism is very effective at walking speeds.
But when running, the speed is faster, the impact is greater, and the airtime completely changes the dynamics. The mechanisms of lumbar spine torsion are no longer sufficient.
Running requires a deeper, more extensive rotation—external rotation of the hip joint and three-dimensional gyroscopic action of the pelvis.
The rotation of the gyroscope in this pelvis causes the left pelvis to rotate forward naturally as the right foot steps forward, while the right pelvis rotates backward. The spine stores elastic potential energy in this rotation and then releases it at the moment of propulsion—like a tightly twisted spring suddenly released.
This is not just a matter of aesthetics; it is a core mechanism for running efficiency and safety.
The Modern Runner's Pain: Gyroscope Locked Down by Prolonged Sitting
Since our bodies have such a perfect built-in gyroscope system, why is it that running is both strenuous and harmful to our knees?
The key lies in how modern lifestyles "freeze" joints.
Prolonged sitting causes extreme tightness in the hip joint, loss of elasticity in the surrounding fascia, and the femur firmly stuck in the acetabulum. The hip flexors continue to shorten, and the deep rotator muscles responsible for external rotation gradually become inactive. This process is very slow—you won't feel a sudden loss of hip rotation one day; you just slowly lose that ability until one day you realize how tight it is.
The thoracic spine is also a victim. Modern life makes our movements increasingly linear—walking back and forth, maintaining a fixed posture while facing a screen. The thoracic spine has almost no opportunity to rotate, and its rotational ability gradually becomes limited.
When the pelvic gyroscope loses its three-dimensional rotational freedom, running can only resort to secondary methods—compensating with the knee joint, twisting the lumbar spine, or balancing with large-scale shoulder swaying. This "head-on" compensatory mode on a straight road not only consumes a lot of metabolic energy, but is also the main culprit for runner's knee, iliotibial band syndrome (ITBS), and lower back pain.
What does a locked pelvis do to running?
When the gyroscope function of the pelvis disappears, running loses one of the most important propulsion mechanisms.
The elastic potential energy that should have been stored in the rotation has disappeared. Each step forward relies solely on direct muscle exertion—the leg muscles bear more of the work and tire faster. Without the coordinated counter-rotation of the upper and lower body, the impact cannot be dissipated by rotation and is instead absorbed directly by the bones and joints.
Gait becomes less fluid, energy consumption increases, and the risk of injury rises.
This is why many runners, despite having strong muscles, struggle to run and experience back and leg pain afterward—not because they lack muscle mass, but because their pelvic gyroscope is malfunctioning.
How will Chanrou unlock this lock?
Chanrou's choreography was almost tailor-made for this problem.
Three-dimensional spiral motion, reawakening rotational capabilities
Every movement of Chanrou incorporates a rotational element. There is a spiral when the arms extend, a rotation when the spine bends, and external and internal rotation of the hip joint when the legs move. These multi-directional rotational stimuli continuously awaken the rotational muscle groups that have slowly become dormant due to prolonged sitting and linear movements—the deep hip external rotators, thoracic rotators, and multifidus muscles of the spine.
Narrowing the pelvis establishes a foundation for rotation.
The free rotation of the pelvis requires a stable center. Chanrou's Narrowing of the Pelvis is precisely about establishing this center—not by locking the pelvis with outer muscles, but by creating a dynamic and stable foundation through a deep support system, allowing the pelvis to rotate freely on this foundation, rather than swaying uncontrollably.
This feeling is similar to the central axis of a gyroscope—the more stable the center, the smoother the rotation.
Extending in opposite directions creates rotational elasticity.
The gentle, opposing extensions allow the top of the head to rise and the tailbone to sink downwards. This bidirectional tension keeps the spine in a flexible, extended state—not stiff, but like a tensioned spring. In this state, the rotation of the pelvis stores elastic potential energy within the spine, which is naturally released during propulsion—each step carries that propulsive force that grows from deep within.
You can feel it now.
Stand up with your feet shoulder-width apart.
Try stepping forward with your right foot, and feel your pelvis rotate accordingly—your right pelvis moving backward and your left pelvis moving forward. Then step forward with your left foot, feeling your pelvis rotate in the opposite direction.
If the rotation feels natural and smooth, your pelvic gyroscope is functioning well. If you feel that your pelvis is hardly rotating, or if it's difficult or stuck when you rotate it—that's exactly what Chanrou wants to help you resolve.
Blindly "striving" and tensing your body is wearing down your joints; while the "efficiency" that Chanrou pursues is nourishing your nervous system.
Running shouldn't be a brutal tug-of-war between willpower and joint lifespan. Try to let go of brute force during training, loosen the constraints on your hip joints, and allow your spine and pelvis to flow smoothly like a river.
When your body regains the dynamic balance of the bidirectional gyroscope, you will find that running can be so elegant and so light.
