Popsugar Fitness Workouts How to Build Rock-Solid Abs A Fitness Trainer Recommends These 9 Things For Rock-Solid Abs July 29, 2018 by Jenny Sugar View On One Page Photo 5 of 9 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 Ab Rollout When doing ab rollouts, Susan says your core is working overtime to prevent your back from arching. You can also do these in plank position or using a TRX. Previous Next Start Slideshow WorkoutsBelly FatWeight LossAb Exercises