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A 10-Minute Circuit Workout for Flat Abs By Holly Perkins Updated January 9, 2020 Sculpting sleek abs isn’t just about the front-and-center six-pack muscles — it’s about your entire core from chest and upper back to glutes and hip flexors. This workout hits all those muscles and everything in between. In just 10 minutes, you’ll be on your way to flatter abs.Credit: […]