A doctor has shared a simple exercise he claims helps tighten and flatten ... sure your back is always in contact with the floor. Dr Berg said: "Do this every day, and within one to two weeks ...

We chatted with a fitness pro who outlines the five best core exercises to flatten your lower belly. "These movements ... exercises three to four times a week with a minimum of one rest day ...

Cynthia Sass, RD, a dietitian based in New York City and Los Angeles, recommends adding chili peppers to an omelet, salad, or stir-fry to maximize your flat-belly gains. Avocados are all the rage ...