Why do we hold our breaths when we push or pull on heavy objects?
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If by this you mean strained breathing, it’s related to how the body tightens up so as to create better tension. Think about it, if you were trying to create leverage against something limp, then it would be dampened, but if you’re trying to create leverage against something solid, more of the energy is transferred efficiently. You’re basically doing this with your body when you exert yourself on strenuous tasks
The point is that this also includes the intercostal muscles of the ribcage. As well as other core muscle groups. All of which are necessary for respiration
So when you’re performing a feat of strength, you’re both trying to tighten everything and also have parts mobile enough to allow things like breathing
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