You should take into account the specific situation of "waist-binding" in medieval Europe-only women did this in social situations. Not everyone wears a waist all the time. Such a person can do it in a short time without doing manual labor or even walking a long way. At this time, the internal organs were indeed deformed, mainly compressing the space between the lungs and the stomach. It's like taking a normal picture of the corresponding internal organs to reduce the lungs and stomach.

Therefore, these women are very easy to faint because of lack of oxygen (the lungs can't breathe air) or hypoglycemia and anemia (hunger).