Even though it’s a skeletal muscle like your biceps or lats, for the most part it’s an involuntary muscle and you can’t control it. Even the old-time stomach vacuum poses are mostly abdominal exercises, they’re not that related to your diaphragm. The Valsava Maneuver involves contracting the diaphragm, and people who use it while exercising will strengthen the diaphragm muscle, but because of our limited conscious control over the muscle it’s difficult to target it directly.
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