A segmental spinal flexion (and extension on the return) performed supine → seated → forward flexion, then reversing to articulate down. Trains rib–pelvis integration, eccentric control, and breathing under load. It’s the poster child for peel, don’t yank.
The Secrets of Posture Movement and Breath.
Obliques (aka Criss-Cross family) train segmental thoracic flexion + rotation while the pelvis stays quiet. They build rotational trunk endurance, hip dissociation, and breath...
Understanding the difference between Classical vs. Contemporary Pilates