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Originally Posted by hannukah harry
if the only way you can manage a lift is by increasing your intra-abdominal pressure by holding your breath, then the lift is too heavy. you're not exhaling for tension, you're exhaling to avoid huge exercise-induced spikes in your blood pressure that can cause damage to your vasculature and heart.
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powerlifters use belts to increase their IAP to give them more support. it also allows the spinal erector muscles to produce less force during the lift.