03/09/2026
Muscle Monday: The Diaphragm
Most people think of the diaphragm only as a breathing muscle, but it actually plays a major role in posture, core stability, and tension patterns in the body.
The diaphragm sits at the base of the ribcage and separates the chest cavity from the abdominal cavity.
✨ Origin:
• Inner surfaces of the lower ribs, sternum, and lumbar spine
✨ Insertion:
• Central tendon of the diaphragm
Its main job is to contract and move downward during inhalation, allowing the lungs to expand. But it also works closely with the core, pelvic floor, and deep spinal muscles to stabilize the body.
When the diaphragm becomes restricted or we rely on shallow breathing, it can contribute to:
• Neck and shoulder tension
• Rib and mid-back tightness
• Poor posture
• Increased stress and nervous system tension
• Reduced core stability
When breathing is efficient and the diaphragm moves well, it helps the body relax, stabilize, and move more efficiently.
Sometimes improving mobility in the ribs and surrounding muscles can make breathing feel easier and reduce tension throughout the upper body. This can be done with either massage or myofascial release.
✨ If your neck, ribs, or upper back feel constantly tight, your breathing mechanics may be part of the picture.
