‘Muscles are made in the gym and abs (or flat abs) are made in the kitchen,'” Brown said. Ever heard that fat loss is 80% diet and 20% exercise? Brown says there’s no scientific study to ...

But here's the kicker: traditional ab exercises alone won't cut it. You need a combo of fat-burning and core-strengthening workouts. That's why we turned to Efthalia Tsimkas, a trainer at Brooklyn ...