: Keep your lower back (the S-curve) completely flat.

: Move only from the mid-back and neck. This isolates the thoracic spine while keeping the lumbar "fixed" and protected. 2. Stabilized Bird-Dog This is a staple of the Hartlova method.

: Never hold your breath during the "fixed" holds; use diaphragmatic breathing to maintain internal pressure.

: The block must not fall. This forces the "fixed" alignment of the sacrum, ensuring your glutes and core are doing the work rather than your spine twisting to compensate. 3. The Supported Bridge (Sacrum Fix) Using a block or a firm pillow under the tailbone:

: Extend the opposite arm and leg, but place a yoga block on your lower back.

Below is an in-depth look at this routine, why it gained popularity, and how to perform the core movements. The Katerina Hartlova Yoga Philosophy: Stability First