These are core pieces of the Classical Ab Series. They train segmental thoracic flexion and hip dissociation while the trunk stays organized (anti-extension, anti-rotation). Breath shapes the abdomen from the inside—your “free core brace.”
The Essential Language of Movement, Anatomy, and Exercise
Obliques (aka Criss-Cross family) train segmental thoracic flexion + rotation while the pelvis stays quiet. They build rotational trunk endurance, hip dissociation, and breath...