Popsugar Fitness Workouts Ab Exercises For a Bad Back If You Have a Bad Back, Trainers Recommend These 11 Ab Exercises For Strength and Support August 6, 2019 by Maggie Ryan View On One Page Photo 5 of 12 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Anti-Extension: Dead Bug Crunch Lie on the floor with knees bent at 90 degrees and your feet lifted off the floor. Extend your arms up toward the ceiling. Reach back with your right arm and out with your left leg. Keep your lower back flat on the floor. Pause, then return to the starting position. Repeat on the other side. This completes one rep. Previous Next Start Slideshow WorkoutsAb WorkoutsBack PainInjury PreventionAb Exercises