: why do we take a deep breath whenever we want to lift something heavy?
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It is not like one muscle only have one job. Especially in the torso where each muscle have two or three different jobs. If not specific jobs the muscles can all at least control the pressure in the body to help out with breathing and digestion. But this means that it can be hard to do two things at once, for example breathe and lift something heavy. These tasks often use the same core muscles. Lifting can prevent you from breathing at all as the muscles not involved in lifting does not have the strength to overcome the ones which do. So you instinctively take a deep breath preparing to hold your breath as you lift.
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