Why do we hold our breaths when we push or pull on heavy objects?
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There’s a thing called the Valsalva maneuver, it can actually increase core strength and protect your spine to hold your breath for a big lift.
But as a general rule, repeated lifting or for any duration of time you need to be breathing.
So I think its large an instinct to brace yourself, which seems to have some truth to it, but that instinct is counter-productive in a lot of cases
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