Which cue best supports ribcage stability during arm work on the reformer?

• A. Keep shoulders square and ribs relaxed.
• B. Breathe diaphragmatically using belly breathing.
• C. Tense the obliques to keep ribs down.
• D. Keep ribs connected to the pelvis, prevent rib flare, lengthen the sternum, and breathe laterally to maintain trunk stability.

Answer: (D)

Stability of the ribcage during reformer arm work comes from keeping the ribs connected to the pelvis, preventing rib flare, lengthening the sternum, and breathing laterally to support the trunk. When the ribcage stays anchored to the pelvis and the sternum is lengthened, the thorax stays neutral and the spine has a solid base for the arms to move from without the torso twisting or lifting. Breathing laterally encourages true thoracic expansion to the sides, which supports even intra-abdominal pressure and helps maintain spinal stability as the arms work. This combination allows efficient transfer of effort from the torso to the arms without compensations.

The other cues fall short because, while shoulder positioning matters, simply keeping shoulders square and ribs relaxed can let the ribcage still drift or flare. Belly breathing alone focuses on the diaphragm but may not control rib alignment during dynamic arm work. Tensing the obliques to keep ribs down can create unnecessary stiffness and interfere with natural breathing and fluid movement. The long, coordinated cue that connects the ribs to the pelvis, prevents rib flare, lengthens the sternum, and uses lateral breathing best supports a stable trunk during arm work.