Abdominal Bracing (vs Hollowing)

Bracing is the co-contraction of the entire abdominal wall and trunk musculature (the rectus, both obliques, transverse abdominis, and the spinal extensors) together, producing 360° stiffness around the spine and raising intra-abdominal pressure. The cue is "brace as if about to be punched in the stomach" or "make the waist wide and hard." Bracing keeps the spine in a controlled neutral position (see spine-positioning) under load and is the foundation for core stability (core-stability-vs-strength) and all anti-movement work (anti-movement-concepts).

Hollowing (the "draw-in" maneuver) is a contrasting technique that emphasizes selectively pulling the navel toward the spine to preferentially activate the deep transverse-abdominis. Hollowing arose from motor-control rehabilitation research; it can be useful for teaching deep-muscle activation and in some clinical settings.

Current consensus for performance and heavy loading favors bracing over hollowing, because co-contracting the whole wall produces greater spinal stiffness and stability than isolating one deep muscle. Hollowing alone may not provide enough stability under significant load.

Practical use:

• Set a neutral spine, take a breath into the belly, and brace before lifting, carrying, or performing anti-movement drills.
• Maintain the brace while breathing shallowly behind it during effort (do not fully hold the breath for prolonged efforts; see Valsalva cautions in spine-positioning).
• Bracing is what makes the plank (exercise-plank), Pallof press (exercise-pallof-press), and loaded carries effective.

• Bracing = 360° co-contraction of the whole trunk wall → spinal stiffness + raised intra-abdominal pressure.
• Cue: "brace as if about to be punched."
• Hollowing = draw navel in to isolate transverse abdominis (rehab origin).
• Consensus for load/performance favors bracing (greater stiffness) over hollowing alone.
• Brace to hold a neutral spine before lifting/carrying/anti-movement drills.

• core-stability-vs-strength — bracing is the core-stability foundation.
• anti-movement-concepts — bracing enables anti-movement training.
• transverse-abdominis — key deep stabilizer (emphasized in hollowing).
• spine-positioning — neutral-spine and Valsalva context.
• exercise-plank, exercise-pallof-press — drills that depend on bracing.