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by the way, I have an advice that worked in my situation - I simply started eating less and simply made some fitness in spare time
to obtain a flat stomach you need to do a complex of exercises and diet too if you eat a lot of food your stomach won't be flat ever
Whatever workout you do, if you are skinny, you need to care about nutrition and some supplements and then just be sure in 2-3 months you will see...
Be brave enough to face your bright future