10. Tightening Mask
I know that it might be weird, but have you ever tried to put a mask on your stomach?
Tightening masks work wonders for your face, why wouldn't they work for your stomach?
For me, I use a single egg white mask on my stomach at least three times a week.
You let it dry and then rinse it off and gently scrub it dry.
Within a few months (it does take a while), you'll see a difference!