What is a way to get a flat tummy fast?
Well, you can't get it like in one-day flat, but you can get it in like a week depends how big your tummy is. Just do curl-ups and sit-ups. Or if you have a sibling or friend you can do a routine where the two of you are sitting criss-crossed and back-to-back passing a ball side-to-side to each. Don't think of it as an exercise, just think of it as something you do daily like brush your teeth.
8 minute abs on youtube no equipment needed and running, outside is better because of the terrain but def, the 8 minute abs once or twice a day everyday, and at least 5 pints of water a day it works.