Increases abdominal pressure so you can do more weight on compound excercises.
It has ti be tight as fuck and only on during the set. Because thats how long youll tolerate it.
People who walk around with it, have it far to loose, and use it so their gut looks better.
Ironically, a correctly worn belt makes you look bad, always
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I put mine on before each set, and remove it immediatly after.
Well, 85%+ sets on squat/deadlift