Answer:
A twiggy home
The thinkers usually hold this body part
This is your stomach's way of letting you know you've neglected it.
I can be as thin as a picture frame but my insides have many things you can see.
Each morning I appear to lie at your feet, all day I follow no matter how fast you run. Yet I nearly perish in the midday sun.
It is something you will never see again.