Stomach Sitting Videos Exercises At Home To Get The Stomach Area In Shape?

Exercises at home to get the stomach area in shape? - stomach sitting videos

I'm pretty thin, but not at all in the form.
I wish my stomach n sides are attenuated more.
Do you have an idea of the exercise I could do at home?
I have a band or something like that I can do squats? Links or videos would be awesome.