Two men, same chair, same body weight. One stands up smoothly. The other rocks forward twice and shoves off his knees. Often the difference isn't leg strength. It's that the first man is braced and the second one is loose. Strength leaks out of a soft midsection — and after abdominal or spinal surgery, most of us have gotten very good at staying soft, because soft is what didn't hurt. The research on this is solid and it's been solid for twenty-five years. Cholewicki and colleagues measured trunk stiffness by suddenly releasing a load and recording how much the spine gave. When intra-abdominal pressure was voluntarily raised by contracting the abdominal wall, trunk stiffness went up — measurably. Bracing doesn't just feel steadier. It makes the spine mechanically stiffer, which is exactly what a fused or repaired segment wants. TODAY'S CUE — POWER BREATHING OUT OF THE BOTTOM Sit on a chair. Before you stand: breathe into your belly, not your chest, and shorten the distance between your sternum and your navel — think of curling into a shallow C. Grip the floor with your feet. As you drive up, exhale hard against a nearly closed throat — sharp and pressurized, like inflating a stiff balloon. Now stand up again with none of that: loose belly, casual breath. Most men feel the difference immediately. You didn't get stronger in thirty seconds. You stopped leaking. Part 2 covers where this fits in the weekly practice. Part 1 explains why tension work is a rehabilitation tool nobody calls rehabilitation. Did you feel a difference — yes or no? I want the honest count below. Recover the Strength. Source: Cholewicki J, et al. Intra-abdominal pressure mechanism for stabilizing the lumbar spine; and Lumbar spine stability can be augmented with an abdominal belt and/or increased intra-abdominal pressure. Eur Spine J.