I've heard that isometeric's works well ( holding in stomach tightly for 10 seconds release and back to ten count again for a week)..then start holding in for a 15 or 20 count until you build up to where you can practically hold in your stomach all day! It works if you keep doing it.
If your stomach is large and you have a little 'overhang' like an apron' the best I found was walking taking L~O~N~G strides...you know you are doing it right when you can feel the 'pull' at the hip bones.
I bought a 'wrap for my tummy...it wraps around my back and stomach and I velcro it on the side..it makes the tummy SWEAT ( some say it doesn't work because its water weight and a glass of water will put it back on..I beg to differ because I could swear that I lost at least a 1/2 inch off my stomach when I wore the wrap everyday for a week.
The wrap is made of some type of a rubber foam rubber.
IF you have the 'apron and you have the wrap make sure that your wrap goes under the fat because that area needs to sweat too~
Good Luck~ I let myself go due to illness and a very sudden family loss so I just went to pieces..I'm starting again..
Good Luck to All of us~
Be Well.
ASoutherner~
OH- While hold your tummy in hard and counting PLEASE CONTINUE TO BREATHE LIKE NORMAL..DO NOT HOLD YOUR BREATH...breath

e like usual..it takes a little doing to hold tummy in, count and breathe like usual but its easy