Popsugar Fitness Workouts Best Exercises For Ab Day The 19 Best Exercises For Ab Day March 31, 2017 by Jenny Sugar View On One Page Photo 8 of 20 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 8 Elbow Plank With Hip Dip From an elbow plank, slowly rotate the spine to lower your left hip to just above the floor (about one to two inches from the ground). Come back to elbow plank. Now lower the right hip toward the floor. This counts as one rep. Do as many reps as you can for 20 seconds. Previous Next Start Slideshow WorkoutsStrength TrainingAb Exercises