By flat, I presume you mean so that your stomach and bottom don't stick out. Really, some people's spines will be more curved than other people's and while you can just pull your stomach in using your abdominal/core muscles, some people's spines will never be entirely straight and their bottom will always stick out a little, no matter how hard they try.
Sorry, but that's just how it goes.
your body is made of lots of cells. are you flat?
A stingray has a flat body because it needs to glid thewr the water and because it can
no!
they are flat
the flat layor of skin means on your body all of the flat bit of your skin!
flat fish
Flat.
The shape of a cylinder has two flat sides and a rounded body.
The shape of a cylinder has two flat faces and a circular body
a stingray looks like a flat gray white body with a stinger and an mouth under the flat body while the eyes are on top! :)
It has a flat body and a barbed tail
Torso-the sternum is the flat bone in the center of your chest between them.