How to Position the Spine During Squats, Deadlifts, and Hip Thrusts

For hip thrusts, the video advocates for posterior pelvic tilt at the top of the movement, contrary to the neutral spine often advised. If a neutral spine is maintained, individuals tend to arch, leading to lumbar extension and high compressive forces, which can damage facet joints. Posterior pelvic tilt uses the glutes for hip extension, minimizes erector activation, and thus reduces compressive and shear forces, making the lift safer and more glute-focused. It's safe to have slight flexion here as it's an unloaded movement for the spine.

The video concludes by stressing that spinal biomechanics are complex and require different strategies based on the exercise. The type of loading—axial (vertical) in squats and deadlifts versus horizontal in hip thrusts and back extensions—dictates the optimal lumbo-pelvic hip complex strategy. Adapting your spinal and pelvic posture to the specific exercise and load is key for safety and effectiveness.

During squats and deadlifts, compressive forces are unavoidable due to erector activation needed to maintain form. To prevent injury, maintaining a mostly neutral spine is crucial, though some flexion (around 26 degrees) is common even with good intent. The video recommends a slight anterior pelvic tilt at the bottom of these lifts to safeguard against excessive flexion. Poor hip flexion mobility or hamstring flexibility can lead to butt wink or lumbar rounding, emphasizing the importance of not exceeding anatomical limitations.

The video starts by introducing the lumbo-pelvic hip complex biomechanics, focusing on how the pelvis, hips, and lumbar spine move rhythmically. Anterior pelvic tilt leads to lumbar extension, and posterior pelvic tilt leads to lumbar flexion. This rhythm is critical in exercises, with anterior tilt recommended at the bottom of lifts like squats and deadlifts to protect against excessive lumbar flexion, and slight posterior tilt for exercises like loaded carries or sit-ups to counteract lumbar extension.

Spinal damage often occurs when compressive forces combine with flexion and extension. The majority of compressive forces come from muscular contractions, not just external loads. When the spine experiences compression and then flexes significantly, it can lead to posterolateral disc herniations. Unloaded movements are less dangerous than loaded ones with movement.