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Lunges are another effective leg exercise Romero recommends. “They help sculpt every part of the leg,” she adds. For a more advanced version of lunges add dumbbells. The exercise also recruits core, calf, and even some back muscles for stabilization. To perform a lunge with proper form, keep your front heel on the floor and make sure the rear knee is aimed directly at the floor, not out to the side at an angle.