A very simple action can be done, but you have to stick to it: abdomen, walking, abdomen, sitting, abdomen. As long as you remember to stuff it, you don't have to stuff it all the time, but you must stuff it consciously, because at first, you won't be used to stuffing it all the time. If you insist on consciously hugging your knees, you will definitely see the effect after one month, and your body will stretch. My mother is now in her forties and has no stomach at all.