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Normally, we inhale before doing a rep in the typical lift. However, when comes to abs eg: wood chopper, crunch etc, it is often advised to exhale before doing the rep. Why?

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Inhaling increases intra-abdominal pressure, increasing the rigidity of the trunk.

If the point of the exercise you are doing is to have a mobile spine, then increasing the rigidity of the trunk can work against that.

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