Eli5: What’s happening when someone sucks their tummy in? Why can’t one “suck in” say, their thigh?

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Eli5: What’s happening when someone sucks their tummy in? Why can’t one “suck in” say, their thigh?

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There are way more muscles in the abdomen region that are connected in different manners that the typical connection we find in our arms and legs.

Plus your lungs/diaphram can release excess air and help move/ slim you down momentarily.

Pro physique models or bobybuilders call this vacuumin and do so by releasing air while flexing, taking in small.air before forcing ever more air out. Its a sign or top level abdomen control and development

Your abdomen and thorax are body cavities. By contracting your muscles and diaphragm in just the right way you can decrease some of that empty space and temporarily make your abdomen appear smaller. There is no empty space in your thigh. Your femur is surrounded by muscle, which is surrounded by skin. It is simply not possible to compress your bones, and why would you want to???