system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is happening in your body when you “suck” your stomach in, and why does it make you look smaller? Ty!
gpt
You lift up your diaphragm(muscle below your lungs that you breathe with) and also you expand your chest. Since most of your organs are connected with well connective tissue they go up with the diaphragm and the space you created by expanding your chest.
Belly gets thinner chest gets bigger.