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Vacuums are an excellent exercise, just like PC contraction. People's "natural" instinct if you ask them to "suck in their gut" is the reverse of what's effective: They breathe IN very DEEP and THEN try to SUCK in. It's sort of like hardening a bloat,.... (sorta).
However, with a vacuum, a forced exhale and squeeze, sucking in, deep within the abdomen,... it's also a Pilates movement, an exercise that is performed in almost every Pilates movement simultaneously. They call it zipping up and hollowing (for visual ID).
Good stuff.
Many weight lifters do the reverse and bloat or press their abs OUTWARDS, against weight belts if they wear them, or just pressing out in general, weaking their pelvic floor as well as distending their abdomen.
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